k - nist · 2017. 11. 30. · crpl-f166 part b . for official use . i n n f’. r\ k . part b ....

$: K - NIST · 2017. 11. 30. · crpl-f166 part b . for official use . i n n f’. r\ k . part b . solar - geophysical data . issued . june 1958 . u. s. department of commerce national$
CRPL-F166 PART B FOR OFFICIAL USE

i n n F’. r\ K

PART B

SOLAR - GEOPHYSICAL DATA

ISSUED JUNE 1958

U. S. DEPARTMENT OF COMMERCE NATIONAL BUREAU OF STANDARDS

CENTRAL RADIO PROPAGATION LABORATORY BOULDER, COLORADO

CRPL-F 166

PART B

NATIONAL BUREAU OF STANDARDS CENTRAL RADIO PROPAGATION LABORATORY

BOULDER, COLORADO 30 June 1958

Issued

SOLAR-GEOPHYSICAL DATA

CONTENTS

INTRODUCTION

Description of Tables and Graphs

I DAILY SOLAR INDICES

(a) Relative Sunspot Numbers and 2000 Me Solar Flux (b) Graph of Sunspot Cycle (c) Final Relative Sunspot Numbers, Rz, for 1957

II SOLAR CENTERS OF ACTIVITY

(a) Calcium Plage and Sunspot Regions (b) Coronal Line Emission Indices-Apri1 1958 (c) Coronal Lime Emission Indices-May 1958

III SOLAR FLARES

(a-i) Optical Observations-May 1958 (j) Flare Patrol Observations-May 1958 (k,m) Subflares-April 1958 (n-r) Optical Observations - Addenda to July 1957 (s) Final Flare Patrol Observations-July 1957 (t,u) Ionospheric Effects-Apri1 1958

IV SOLAR RADIO WAVES

(a) 2800 Me — Outstanding Occurrences (Ottawa) May 1958 Note: May data for 200 Me (Cornell) and April and

May data for 167 and 470 Me (Boulder) will appear in a later issue.

V GEOMAGNETIC ACTIVITY INDICES

(a) C, Kp, Ap, and Selected Quiet and Disturbed Days (b) Charts of Kp by Solar Rotations

VI RADIO PROPAGATION QUALITY INDICES

North Atlantic: (a) CRPL Quality Figures and Forecasts (b) Graphs Comparing Forecast and Observed Quality (c,d) Graphs of Useful Frequency Ranges North Pacific: (e) CRPL Quality Figures and Forecasts (f) Graphs Comparing Forecast and Observed Quality

VII ALERT PERIODS AND SPECIAL WORLD INTERVALS

(a) IGY World Warning Agency Decisions for Alerts and SWI

INTRODUCTION

The descriptive text is published quarterly or whenever context of the report is changed. The last issue in which the text appeared was CRFL-F164 Fart B issued April 1950.

In DAILY SOLAR INDICES

May 1958

Zurich Provisional Relative Sunspot

Numbers

RZ

Daily Values Solar Flux at 2800 Me, Ottawa, Canada

Flux

1 250 266 2 246 2 76 3 269 - _

4 268 280 5 267 269

6 223 263 7 198 249 8 177 236 9 150 239

10 181 209

li 166 211 12 160 209 13 114 203 14 103 194 15 106 196

16 110 194 17 116 194 18 123 197 19 140 197 20 132 197

21 162 199 22 165 199 23 171 206 24 204 211 25 192 207

26 170 210 27 157 201 28 160 202 29 192 219 30 178 213 31 181 209

Mean: 175.2 218.5

Apr. 1958

American Relative Sunspot Numbers

Ra'

1 261 2 271 3 227 4 281 5 276

6 235 7 201 8 206 9 176

10 174

11 154 12 105

13 117 14 92

15 119

16 111

17 145 18 157

19 159 20 161

21 176 22 175

23 179 24 164

25 144

26 173 27 155 28 187

29 188 30 223

Mean: 179.7

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CALCIUM PLAGE AND SUNSPOT REGIONS MAY 1958

CMP May 1958

Lat McMath Plage Number

Return of

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Calcium Plage Data Sunspot Data CMP Area

Values Int. History,Age

CMP Area

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01.2 N30 4527 4484 2200 2 mi 3 220 1 £ — £ 01.3 S22 4528 4483 3500 3 z — z 2 460 11 £ A £ 01.9 N23 4529 New 12000 3.5 z — z 1 1360 17 £^—£ 03.4 S15 4530 New 11000 3.5 z /-z 1 1650 34 Z~\ Z 03.8 N30 4531 4488 2500 2 i A i 5

03.9 N15 4533 4490 1800 1.5 £ — £ 5 05.3 N17 4534 4490 1000 1.5 Z \ d 5 05.8 614 4535 New (500) (i) £ \ d 1 06.2 S26 4536 4494 (300) (i) £ — d 3 (20) (1) b — d 06.3 N24 4541 New 500 3 b / £ 1 120 21 bA d

06.5 NO 2 4539 New 1500 2.5 Z / Z 1 160 10 b A £ 07.0 N14 4537 4493 1100 2 Z S-Z 3 200 1 z—z 07.7 N25 4538 4493 9300 3 z — z 3 700 15 £~\_£ 08.7 NO 9 4540 New 1600 2.5 £ V £ 1 290 4 b /— Z 09.7 N22 4542 New 1200 2 z — Z 1

10.4 N15 4543 4498 4100 3 z~\_z 3 290 2 Z~\ Z 10.5 S12 4554 New (300) (1.5) b / Z I (20) (1) b - d 11.7 N14 4545 4498 1000 1.5 z — z 3 11.7 S23 4544 New 300 1.5 Z^- z 1 12.4 N22 4546 4498 1300 1 z— z 3

13.0 S23 4566 New (700) (2) b — Z 1 13.5 S07 4547 New 1600 2.5 Z\r Z 1 130 5 £^ d 13.8 Nil 4550 New 300 1.5 b — d 1 15.3 S20 4548 New 11000 3 Z — Z 1 1070 29 £ ~v £ 16.1 N21 4552 4506 2300 2 z — z 3 (100) (2) b— £

17.4 N12 4551 4511 1000 2 Z \ d 2 18.2 N24 4556 4507 1700 2 zr~ z 3 120 2 bP £ 18.9 S21 4553 4508 2800 2 z Y_ z 2 240 1 £ — £ 19.7 N25 4562 4507 700 1.5 z'r~ z 3 19.9 SO 7 4555 4512 1800 2 z\— z 3 360 3 £ \ £

20.4 N18 4558 4514 1000 1.5 z v z 2 20.6 S22 4565 New 500 2.5 b Z 1 50 1 b _/-£ 20.7 N38 4557 New 3200 3.5 z — z 1 570 2 £~\ d 22.2 NO 8 4563 4519 1400 3 Z-! Z 2 400 19 b A £ 22.5 S12 4559 4517 2200 2 £ \_ Z 3 (50) (2) b— d

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24.7 S08 4572 New 500 2 b— £ 1 25.0 N15 4564 4523 500 1.5 z—z 3 (50) (1) b— d 25.5 S21 4573 4524 1000 1.5 z—z 3 25.7 NO 7 4575 New 900 2.5 b — Z 1 150 15 b A d 26.1 N22 4568 4525 1600 2.5 z — z 5 20 2 b — d

27.9 N10 4574 4529 2100 2.5 Z-TZ 2 220 1 £— £ 28.6 N25 4577 4529 5200 2.5 £~Y £ 2 70 1 b/ £ 28.9 S25 4580 4528 2500 2 Z~A d 3 10 1 b — d 30.3 N24 4578 4529 6500 3 z — z 2 160 6 £ / £ 30.3 S14 4579 4530 8000 3 Z A £ 2 690 9 £~V_ £ 31.6 S31 4584 New 500 2.5 b /— £ 1 (20) (3) b— d

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INTERVALS OF NO FLARE PATROL OBSERVATIONS MAY 1958

HOUR-UT

l I 2 3 4 5 6 7 8 9 10 I I 12 13 14 15 16 17 18 19 20 21 22 23 24

■i

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. - —

11 ■

H ■H wi

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11

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1 1 JJJ

mes indicated are accurate lo the nearest 15 minutes,

ations included: STANDARDS - BOULDER

tacapri (Swedish)

cetri

osa

hens

. ima*

ins ink

■eenwich Royal Observatory,

Herstmonceux

Hawaii

Kodaikanal

McMath-Hulbert

Meudon

Mitaka

Nizamiah

Ondrejov

Ottawa

Royal Observatory,

Edinburgh

Sacramento Peak

Uccle

U. S. Naval Research

Laboratory

Zurich

SUBFLARES NOTED AS FOLLOWS. DATE - UNIVERSAL TIME - COORDINATES

APRIL 1948

NIZAVIAH 01 ATHENS 01

•ATHENS 01 •ATHENS 01 •ATHENS 01 UCCLF 01

i(AROSA 01 *JCCLE 01 tAPRI S 01 iUCCLE 01 UCCLE 01 UCCLE 01 UCCLE 01 MCMATh 01 MCMATH 01

♦ MCMATH 01 ♦MCMATH 01 ♦OTTAWA 01 ♦ OTTAWA 01 ♦OTTAWA 01 ♦ SAC PEAK 01

SAC PEAK 01 MCMATH 01 SAC PEAK 01

♦ OTTAWA 01 ♦ SAC PEAK 01 ♦ SAC PEAK 01 ♦ SAC PEAK 01 ♦ USNRL 01 ♦CLIMAX 01 *MCmATH 01 ♦ SAC PEAK 01 ♦OTTAWA 01 ♦ HUANCAYO 01

SAC PEAK 01 MCMATH 01

♦ MCMATH 01 •CLIMAX 01 ♦ OTTAWA 01 ♦ SAC PEAK 01

MCMATH 01 ♦ SAC PEAK 01 ♦ USNRL 01

MCMATH 01 SAC PCAK 01

♦ SAC PEAK 01 « HAWAII 01

CLIMAX 01 SAC PEAK 01 USNRL 01 SAC PEAK 01 SAC PEAK 01 SAC PEAK 01 SAC PEAK 01 SAC PEAK 01 HAWAII 01

ATHENS 02 ATHENS 02 UCCLE 02 USNRL 02 OTTAWA 02

♦ OTTAWA 02 ♦ ZURICH 02 ♦ OTTAWA 02 ♦ USNRL 02 ♦ MCMATH 02 ♦ CAPRI S 02

USNRL 02 ♦ USNRL 02 ♦ USNRL 02

USNRL 02 OTTAWA 02

♦ CAPRI S 02 ♦ MCMATH 02 ♦ USNRL 02 ♦ MCMATh 02

USNRL 02 MCMATH 02

♦ MCMATH 02 MCMATH 02 MCMATH 02 MCMATH 02 OTTAWA 02 MCMATH 02

♦ OTTAWA 02 MCMATH 02 USNRL 02 MCMATH 02

♦ MCMATH 02 HAWAII 02 MCMATH 02 MCMATH 02 MCMATH 02

ATHENS ATHENS

♦ CAPRI S UCCLE

♦ UCCLE UCCLE UCCLE UCCLE UCCLE WENDEL MCMATH USNRL WENDEL

0502 E N35 E39 0655 E S03 W63 0736 E S12 W45 0738 E Sll W39 0756 E N26 E60 0928 S13 W53 0936 S19 E39 0938 Sll W83 0958 E S12 W50 1031 N41 E 44 1105 S18 W28 1105 S22 W29 1132 S14 Ell 1249 N33 E33 1310 S10 W52 1325 N08 E90 1328 S18 E49 1328 S16 E48 1412 N30 E40 1413 N37 E35 1413 N33 E38 1455 S12 W56 1455 S12 W53 1535 S14 W54 1537 N36 E38 1537 N20 E42 1537 N37 E38 1600 S06 W42 1605 E S08 W47 1646 S21 W40 1646 S2^ W38 1647 S22 W38 1650 F S23 W37 1650 S22 W34 1652 Sll W57 1740 S16 E36 1800 S24 W38 1802 S21 W40 1804 E S24 W38 1805 S24 W40 1822 N34 E30 1845 N25 E45 1846 N25 E44 1905 S16 E35 1910 S15 E35 2002 S14 W57 2004 S12 W59 2034 S14 E33 2035 S16 E35 2035 SI5 E35 2037 S22 W24 2152 S16 E34 2217 Sll W60 2240 S25 W42 2307 S13 W50 2312 S15 W52

0716 E N24 E38 0740 E N33 E21 0916 E S26 E82 1240 N33 E20 1241 N33 E 19 1252 S21 W39 1340 E S18 E23 1352 S17 E31 1352 S18 E31 1355 N20 E36 1356 E N22 E35 1423 S22 W50 1425 S23 W40 1506 N36 E26 1517 N32 E18 1518 N31 E16 1545 E S17 E27 1609 E N30 E20 1609 N 31 E19 1650 F N2P E30 1705 S18 E23 1722 N32 E 17 1725 S14 W66 1730 S16 E22 1735 S22 W40 1741 N32 E19 1741 N32 E1 7 1803 N32 E 18 1809 S24 E72 1840 S16 E23 1841 SI5 E22 1921 N20 E25 1922 S16 E23 1936 N33 E18 1945 N32 E17 1948 S23 W42 2043 S16 E23

03 0628 E O3 0752 c 03 0826 E 03 0858 03 0924 03 0928 03 0930 03 1003 03 1006 03 1102 E 03 1150 03 1240 03 1253 E

N32 E10 S15 W17 N34 E18 N36 E 1 9 N32 E10 Sll W90 S22 W64 S15 W 2 0 S20 E15 N33 E20 N33 E 15 N49 E15 Nil E72

USNRL 03 ZURICH 03

* OTTAWA 03 *USNRL 03

ZURICH 03 * USNRL 03

SAC PEAK 03 MCMATH 03 USNRL 03 OTTAWA 03 MCMATH 03

* SAC PEAK 03 * MCMATH 03

SAC PEAK 03 MCMATH 03 WENDEL 03 SAC PEAK 03 CLIMAX 03 MCMATH 03 USNRL 03 SAC PEAK 03

* MCMATH 03 * SAC PEAK 03

USNRL 03 MCMATH 03

* USNRL 03 MCMATH 03 SAC PEAK 03 USNRL 03 USNRL 03 SAC PEAK 03 MCMATH 03

* USNRL 03 USNRL 03 USNRL 03 USNRL 03

* MCMATH 03 * SAC PEAK 03

USNRL 03 CLIMAX 03 USNRL 03 USNRL 03 SAC PEAK 03 CLIMAX 03 SAC PEAK 03 SAC PEAK 03

ATHENS 04 ATHENS 04 ATHENS 04 ATHENS 04 ATHENS 04 USNRL 04 USNRL 04 MCMATH 04 MCMATH 04 OTTAWA 04 USNRL 04 OTTAWA 04 USNRL 04 USNRL 04 OTTAWA 04 CLIMAX 04 USNRL 04 USNRL 04 USNRL 04 USNRL 04 USNRL 04 MCMATH 04

* USNRL 04 MCMATH 04 USNRL 04 MCMATH 04

1254 N14 E71 1320 E S15 Ell 1323 S25 E66 1329 E S27 E70 1350 N13 E71 1405 S15 E14 1410 N31 E14 1411 N32 E14 1412 N32 E14 1415 S19 E 13 1511 N13 E 70 1530 S17 Ell 1540 S16 E12 1555 S17 Ell 1556 S16 E12 1603 E N23 E 1 8 1647 N31 E08 1651 N31 E06 1651 N32 E07 1651 N32 EOR 1725 N35 El5 1725 S15 E10 1725 S17 E09 1727 N29 E13 1727 N28 E12 1727 S14 E10 1745 N30 E13 1745 N28 Ell 1746 N30 E 12 1803 N32 E10 1805 N28 Ell 1807 N13 E75 1820 S25 E66 1821 N34 E12 1848 S09 Ell 1855 N24 W13 1909 S15 E10 1915 S16 E08 1919 E N37 E12 2001 S26 E67 2010 N09 W26 2040 S15 E09 2122 S17 E09 2123 S13 E09 2357 N29 W01 2402 S19 E07

0628 E N13 E59 0658 E N16 E37 0701 E Nil E61 0704 E N21 E06 0706 E N13 E62 1217 E NO8 W35 1247 N32 WO? 1247 N32 W04 1305 N36 W06 1305 N36 W08 1306 S20 W65 1313 N20 E05 1314 N21 WO6 1324 S13 W90 1334 N20 E08 1427 N09 E65 1507 S18 E01 1527 NlO E24 1559 S18 W73 1626 N22 E06 1833 N30 W03 1939 S07 W33 1953 E S15 W05 2010 N34 E07 2013 N35 WO8 2052 N13 E53

ATHENS 05 ATHENS 05

* ATHENS 05 * ATHENS 05

WENDEL 05 AROSA 05 OTTAWA 05 OTTAWA 05 OTTAWA 05 SAC PEAK 05 SAC PEAK 05 SAC PEAK 05 SAC PEAK 05 HAWAII 05 SAC PEAK 05 SAC PEAK 05 SAC PEAK 05

SAC PEAK 06 * MCMATH 06 * SAC PEAK 06

SAC PEAK 06 SAC PEAK 06 CLIMAX 06 SAC PEAK 06 HAWAII 06 SAC PEAK 06 SAC PEAK 06 CLIMAX 06

0613 E S15 W03 0630 E S15 WO4 0728 N21 WOO 0728 S18 W08 0835 E N12 E47 1035 N05 E58 1327 N12 E43 1409 S20 W09 1422 N12 E34 1730 S21 W12 1305 N30 W16 2002 N26 W37 2110 Nil E52 2114 Nil E53 2142 N28 W39 2250 NO7 W56 2250 N05 E5S

1435 S24 E18 1652 N30 W50 1655 N29 W49 1905 N25 W38 2002 N31 W32 2020 Nil E01 2020 N13 EOl 2022 N12 EOl 2025 N16 E42 2305 N17 E43 2310 E N16 E41

ATHENS 07 ATHENS 07 SAC PEAK 07 SAC PEAK 07

0727 N18 E29 0727 N16 E33 1417 N17 E02 1505 N29 W65

as flare of Importance > 1 by other observatories (see ♦Rated CRPL-F 165 Part B).

SUBFLARES NOTED AS FOLLOWS# DATE UNIVERSAL TIME - COORDINATES

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APRIL I9M

SAC PEA* 07 SAC PEAK 07 MCMATH 07 SAC PEAK 07 USNRL 07 SAC PEAK 07 MCMATH 07 SAC PEAK 07 USNRL 07 USNRL 07 MCMATH 07 SAC PEAK 07 SAC PEAK 07 MCMATH 07 SAC PEAK 07 SAC PEAK 07 SAC PEAK 07 SAC PEAK 07

ATHENS 08 CAPRI S 08 MCMATH 08 MCMATH 08 MCMATH 08 USNRL 08 MCMATH 08 USNRL 08 MCMATH 08 MCMATH 08 MCMATH 08 MCMATH 08 OTTAWA 08 MCMATH 08 MCMATH 08 MCMATH 08 USNRL 08 USNRL 08 USNRL 08

UCCLE 09 MCMATH 09 MCMATH 09 MCMATH 09 USNRL 09 MCMATH 09 MCMATH 09 MCMATH 09 MCMATH 09

ATHENS 10 ATHENS 10 CAPRI G 10 SAC PEAK 10 SAC PEAK 10 SAC PEAK 10 SAC PEAK 10 SAC PEAK 10 SAC PEAK 10 OTTAWA 10 SAC PEAK 10 SAC PEAK 10 SAC PEAK 10 SAC PEAK 10 SAC PEAK 10 SAC PEAK 10 CLIMAX 10

SAC PEAK 11 SAC PEAK 11 SAC PEAK 11 SAC PEAK 11 SAC PEAK 11

UCCLE 12 SAC PEAK 12 CLIMAX 12 MCMATH 12 SAC PEAK 12 MCMATH 12 SAC PEAK 12

UCCLE 13 USNRL 13 MCMATH 13 MCMATH 13 MCMATH 13

1525 N17 E29 1552 N16 E01 1613 N10 E26 1617 N09 E24 1656 E N48 E65 1895 N16 W01 1846 N16 EOO 2025 N15 E02 2027 E N17 W03 2034 N15 E02 2034 S14 W44 2045 S14 W44 2050 N15 E05 2117 S14 E18 2117 S14 El8 2302 N17 W04 2322 N15 W04 2332 N07 E18

0753 N16 WOl 0852 N33 W48 1126 S13 E56 1138 N15 E16 1150 N16 W20 1205 E 506 E85 1207 S14 E56 1211 S14 E59 1258 S15 W80 1315 S13 E56 1333 S20 W90 1419 N16 E16 1443 N14 W06 1445 N14 W06 1612 N15 E22 1633 N13 E05 1801 N14 WH 1913 N12 W31 1926 N13 E03

0957 N21 W60 1154 S19 W90 1247 N42 E09 1405 N42 E09 1446 N26 W57 1723 S29 W90 2020 N20 W02 2135 N18 W65 2158 S15 W70

0622 N15 W07 0651 N24 W72 1314 E N15 W38 1430 N16 W41 1447 N08 W16 1510 N17 W41 1545 N07 WH 1557 N33 W90 1650 N12 W58 1745 N05 W12 1820 N15 W15 1925 N20 W80 1940 S14 E28 2030 N25 W85 2035 N16 W90 2100 NO6 WO3 2101 NO7 W12

1510 N16 W90 1555 N15 W90 1637 N28 W87 1947 N07 W26 2125 U S15 E13

0836 N30 W70 1700 N13 E18 1940 N19 E19 1940 E N20 E18 1942 E N19 E19 1945 S12 W52 2222 N19 E18

0952 S16 E35 1403 N16 W44 1404 N15 W43 1453 N10 E10 1726 N25 W80

* OTTAWA UCCLE

* MCMATH MCMATH MCMATH USNRL USNRL SAC PEAK MCMATH OTTAWA USNRL MCMATH

* SAC PEAK * USNRL

MCMATH SAC PEAK

* SAC PEAK * SAC PEAK * USNRL * USNRL * SAC PEAK

MCMATH SAC PEAK USNRL MCMATH

* USNRL * SAC PEAK

SAC PEAK MCMATH USNRL SAC PEAK SAC PEAK

NIZAMIAH * CAPRI S

OTTAWA MCMATH

* MCMATH MCMATH MCMATH

* OTTAWA * SAC PEAK

SAC PEAK HUANCAYO MCMATH

* USNRL MCMATH MCMATH MCMATH MCMATH

* CLIMAX * MCMATH

CLIMAX UCCLE USNRL USNRL USNRL USNRL MCMATH USNRL

* MCMATH USNRL

* CLIMAX * CLIMAX * USNRL

USNRL MCMATH MCMATh

* USNRL MCMATH USNRL USNRL

* SAC PEAK * USNRL

MCMATh MCMATH MCMATH USNRL USNRL SAC PEAK MCMATH USNRL

* SAC PEAK MfcMATH

15 1148 15 1154 15 1227 15 1228 15 1318 15 1318 15 1326 15 1437 15 1438 15 1438 15 1439 15 1500 15 1535 15 1536 15 1615 15 1625 15 1735 15 1735 15 1738 15 1808 15 1810 15 2008 15 2010 15 2011 15 2020 15 2026 15 2027 15 2035 15 2035 15 2037 15 2205 15 2310

16 0535 16 1017 16 1311 16 1311 16 1322 16 1400 16 1408 16 1514 16 1543 16 1550 16 1553 16 1553 16 1649 16 1844 16 1903 16 1931 16 1957 16 2116 16 2116

17 0032 17 1024 17 1158 17 1158 17 1158 17 1158 17 1200 17 1228 17 1522 17 1545 17 1615 17 1627 17 1627 17 1901 17 1940 17 2118

18 1212 18 1229 18 1230 18 1404 18 1442 18 1443 18 1525 18 1611 18 1624 18 1625 18 1818 18* 1820 18 1835 18 1836 18 2110 18 2120

N12 WH E N27 W80

S20 E75 N15 W70 520 E70 521 E72 Sll W38 N28 W80 N28 W85 N26 W74 N27 W78 N12 W22 N16 E47 N17 E47 N16 £46 S21 E75 520 E70 N16 E46 N17 E46

E S20 E70 521 E70 N16 E45 N16 E45 N16 E45 N26 W90 SlO W41 S10 W42 N16 E44 N16 E45 SlO W41 N17 E45 N16 E43

S20 E64 E S23 E62

519 E54 520 E60 S20 E60 N07 W18 N23 E60 N12 W35

E S18 E59 N17 E29

E N16 E31 N17 E28 S20 E60 S20 E50 N16 E27 N16 E27 N23 E56 N18 E28 N16 E26

N18 E24 519 653 N19 E17

E N12 E80 E N12 W44 E N25 E50

N17 E17 517 E42 520 E45 508 E67 521 E38 509 E68 508 E67 518 E45 S21 E44 S21 E44

E S20 E35 S15 E 90 S15 E90 520 E33 N21 E36 N25 E36 506 W70 507 W75 N14 W65 Nil W64 509 E90

E SO'9 E90 N20 W50 S09 E85 N22 E32 S20 £30

USNRL 14 MCMATH 14 USNRL 14 SAC PEAK 14 USNRL 14 MCMATH 14 USNRL 14 USNRL 14 USNRL 14 MCMATH 14 WENDEL 14 USNRL 14 USNRL 14 SAC PEAK 14 MCMATH 14 SAC PEAK 14 USNRL 14 MCMATH 14 USNRL 14 SAC PEAK 14

UCCLE 15

1202 N27 W58 1300 N26 *60 1418 Sll W70 1422 NlO W71 145C N27 W60 1451 N20 W60 1457 S21 E90 1507 N22 W67 1531 E N26 W60 1602 N08 W12 1602 E N17 W04 1641 S20 £87 1650 N26 W60 1650 N12 W09 1705 S21 E90 1712 S21 E87 1713 S21 E89 2134 N22 W70 2138 N23 E90 2250 N15 W62

1049 S19 W80

UCCLE 19 UCCLE 19 MCMATH 19 OTTAWA 19 USNRL 19 CAPRI G 19 MCMATH 19 USNRL 19 CAPRI G 19 UCCLE 19 UCCLE 19 USNRL 19 UCCLE 19 SAC PEAK 19 USNRL 19 UCCLE 19 UCCLE 19 MCMATH 19 UCCLE 19 SAC PEAK 19 SAC PEAK 19

1020 N26 E26 1053 N18 W05 1218 N24 E24 1218 N24 £22 1251 N17 W06 1300 E N22 E18 1348 N25 E23 1350 N25 E22 1401 E N22 E18 1426 N26 E24 1511 N18 W05 1525 SlO W90 1528 N21 W03 1547 N25 E21 1551 N26 E20 1553 N21 E21 1636 N21 W10 1717 N25 E20 1719 N18 W10 1902 E N24 E21 2107 N24 E17

SUBFLARES NOTED AS FOLLOWS. DATE - UNIVERSAL TIME - COORDINATES

APRIL 1958

SAC PEAK 19 SAC PEAK 19

CAPRI G 20 CAPRI G 20 UCCLE 20 USNRL 20 CAPRI G 20 SAC PEAK 20 USNRL 20 USNRL 20 USNRL 20 UCCLE 20 SAC PEAK 20 USNRL 20 WENDEL 20 WENDEL 20 WENDEL 20 SAC PEAK 20 SAC PEAK 20 SAC PEAK 20 SAC PEAK 20 SAC PEAK 20 SAC PEAK 20 SAC PEAK 20

ARCETRI 21 WENDEL 21 UCCLE 21 UCCLE 21 USNRL 21 USNRL 21 USNRL 21 SAC PEAK 21 USNRL 21 SAC PEAK 21 USNRL 21 MCMATH 21 USNRL 21 USNRL 21 SAC PEAK 21 USNRL 21 USNRL 21 USNRL 21 SAC PEAK 21 SAC PEAK 21 SAC PEAK 21

ZURICH 22 CAPRI S 22 CAPRI G 22 MCMATH 22 ZURICH 22 MCMATH 22 MCMATH 22 MCMATH 22 SAC PEAK 22 MCMATH 22 SAC PEAK 22 SAC PEAK 22 MCMATH 22 SAC PEAK 22 USNRL 22 USNRL 22 USNRL 22 USNRL 22 USNRL 22 USNRL 22

UCCLE 23 UCCLE 23 CAPRI G 23 UCCLE 23 USNRL 23 USNRL 23 USNRL 23 USNRL 23 USNRL 23 USNRL 23 SAC PEAK 23 MCMATH 23 USNRL 23 SAC PEAK 23 USNRL 23 SAC PEAK 23 USNRL 23 USNRL 23 SAC PEAK 23 USNRL 23 SAC PEAK 23 USNRL 23 USNRL 23 SAC PEAK 23 USNRL 23 SAC PEAK 23

WENDEL 24 ZURICH 24 UCCLE 24 SAC PEAK 24 SAC PEAK 24 SAC PEAK 24 SAC PEAK 24 MCMATH 24 SAC PEAK 24 USNRL 24 USNRL 24

WENDEL 25 USNRL 25 USNRL 25 MCMATH 25 SAC PEAK 25 USNRL 25 SAC PEAK 25 USNRL 25 SAC PEAK 25 USNRL 25 SAC PEAK 25

WENDEL 26 OTTAWA 26 WENDEL 26 USNRL 26 MCMATH 26 CAPRI G 26 SAC PEAK 26 USNRL 26 MCMATH 26 CAPRI G 26 WENDEL 26 USNRL 26 SAC PEAK 26 MCMATH 26 SAC PEAK 26 USNRL 26

2215 S23 E90 2217 S26 E09

0904 N23 Ell 0925 N23 E13 1031 N23 E10 1207 E N19 W70 1249 N22 W70 1350 S26 E01 1351 S26 E02 1450 S25 E01 1506 S25 E01 1506 S24 E03 1512 S25 WOO 1514 S25 E01 1617 E N12 E38 1628 E S25 W53 1649 E N21 W78 1650 N14 E39 1720 N20 W80 1807 S20 W04 1840 S07 E35 2227 S23 E78 2255 N25 E06 2315 N27 Ell

0847 N23 W26 1122 E S22 W04 1154 S13 E59 1208 S13 E59 1215 S13 E56 1219 N18 W35 1307 S12 E57 1712 S22 E70 1731 E S19 E66 1752 N20 W39 1753 E N19 W38 1755 N20 W38 1755 NO8 E65 1807 Sll E61 1810 S26 W15 1812 S25 W14 1848 526 W67 1927 N07 E59 2047 N20 W40 2137 NO8 E61 2335 N10 E22

0808 S06 E34 0828 E S23 W12 1040 N16 E09 1220 N12 W19 1233 N25 W16 1256 S18 W22 1314 N12 W19 1424 N29 WO8 1425 N30 W10 1440 N27 W13 1445 N07 E43 1457 S23 W15 1458 S23 W14 1527 N15 E 12 1750 N15 E09 1916 E Nil Ell 1917 NO9 E41 1934 E N24 W21 2023 E S23 W21 2025 S32 E37

0826 N15 E02 0911 Nil E02 0930 S27 W70 1119 N18 W60 1243 E N15 EOO 1243 E N07 E38 1243 E S21 W34 1345 N26 W34 1457 N16 W05 1503 N19 W06 1512 N26 W36 1512 N26 W33 1527 S23 W32 1702 N24 W34 1704 N25 W35 1815 N07 E25 1822 E Sll E38 1823 N04 E52 1840 N13 W35 1842 N03 W35 1850 N15 WO7 1854 N06 E52 2034 S20 W39 2042 N15 W02 2049 N13 W12 2050 N14 W13

0812 E N23 W40 0813 N23 W41 0816 Nil E29 1255 N10 E24 1312 Nil E23 1322 S16 W87 1345 S17 W90 1346 518 W90 1622 N10 E22 1835 N07 E18 1930 S25 W47

1414 E N09 E25 1436 N14 W36 1555 S17 E55 1555 S17 E53 1602 N12 E80 1603 N14 E78 1830 S17 E55 1839 S16 E54 1945 N24 E90 1947 N24 E90 2120 S18 E90

0800 E N13 E73 1225 E N24 E75 1225 E N20 E 82 1303 N15 E72 1355 E S20 W70 1400 N12 W78 1410 N29 E^O 1415 N30 E 1416 N30 E90 1438 N 17 E69 1442 E N16 E 71 1501 N25 E77 1552 S10 W19 1553 SlO E20 1605 N23 E80 1607 N25 E77

WENDEL * USNRL

MCMATh MCMATH CL IMAX SAC PEAK

* CAPRI S UCCLE CAPRI G OTTAWA CAPRI G OTTAWA OTTAWA CAPRI G CAPRI G SAC PEAK OTTAWA

* SAC PEAK SAC PEAK SAC PEAK SAC PEAK SAC PEAK SAC PEAK SAC PEAK HAWAI I SAC PEAK SAC PEAK HAWAI I SAC PEAK SAC PEAK

NIZAM I AH SAC PEAK SAC PEAK

* SAC PEAK CAPRI G CAPRI G SAC PEAK SAC PEAK SAC PEAK SAC PEAK SAC PEAK SAC PEAK SAC PEAK SAC PEAK SAC PEAK

* SAC PEAK

CAPRI G * SAC PEAK

CAPRI G SAC PEAK USNRL SAC PEAK

* MCMATH * SAC PEAK

USNRL CAPRI G SAC PEAK CAPRI G USNRL SAC PEAK SAC PEAK CAPRI G USNRL CAPRI G CAPRI G SAC PEAK USNRL

* SAC PEAK * USNRL

USNRL MCMATH

* SAC PEAK HAWAI I SAC PEAK SAC PEAK SAC PEAK SAC PEAK HAWAI I SAC PEAK

CAPRI G WENDEL UCCLE

* UCCLE CAPRI G

* UCCLE * UCCLE * P. 0 HER ST

CAPRI G UCCLE

* MCMATH * OTTAWA * USNRL * USNRL

SAC PEAK USNRL MCMATH

* CAPRI G * SAC PEAK

SAC PEAK * WENDEL * USNRL * CAPRI S

SAC PEAK * SAC PEAK * OTTAWA

MCMATH SAC PEAK USNRL MCMATH SAC PEAK MCMATH SAC PEAK MCMATH OTTAWA USNRL SAC PEAK MCMATh SAC PEAK MCMATH MCMATH SAC PEAK SAC PEAK MCMATH

* SAC PEAK * SAC PEAK

SAC PEAK MCMATH

* SAC PEAK SAC PEAK SAC PEAK

* SAC PEAK

26 1611 E N18 E75 26 1621 S22 E60 26 1624 Nil E03 26 1955 N13 E24 26 2259 N26 E79 26 2300 N23 E80

27 0750 E 27 0918 27 0919 E 27 1103 E 27 1113 E 27 1117 27 1206 27 1210 27 1213 27 1350 27 1350 27 1455 27 1647 27 1802 27 1850 27 1855 27 1902 27 1910

27 2127 27 2228 27 2322 27 2325

N09 W13 N15 'W60 N14 W54 N16 E57 N15 E62 N16 E57 N21 E 5 3 N14 W66 N21 E67 N20 E69 N20 E66 S16 E77 N16 E55 N30 E75 N31 E75 N08 E52 N12 W21 N18 E60 S12 E80 S15 E77 N17 E54 N15 E56 NO 8 WO 8 S20 E53

28 1032 N21 E49 28 1255 E N21 E46 28 1420 N26 Ell 28 1450 N20 E44 28 1548 E S16 E58 28 1551 N16 E42 28 1552 N15 E44 28 1622 N34 E35 28 2032 S16 E62 28 2032 NO8 W23 28 2107 S17 E50 28 2140 N20 E46 28 2210 N20 E32 28 2235 N12 E35 28 2235 S27 E19 28 2332 S16 E61

29 0850 E N15 W38 29 1236 E S14 E51 29 1315 E S19 WO2 29 1344 S15 E53 29 1344 E S15 E50 29 1410 S15 E44 29 1427 E N28 E44 29 1430 S15 E44 29 1435 E S20 W05 29 1<*4^ F 29 1445 29 1445 29 1449 29 1450 E 29 1452 E 29 1541 29 1550 29 1604 29 1608 29 1608 29 1609 29 1650 29 1652 29 1759 29 1800 E 29 2125 29 2226 29 2230 29 223C 29 2315 E 29 2330

S19 WOl S19 W05 513 E 51 514 E47 515 E44 N19 E25 514 E50 515 E48 N20 E43 516 E49 N22 E34 N19 E35 514 E39 515 E40 S14 E45 S14 E44 S22 E46 S19 E40 N20 E33 S22 E46 S19 E36 N20 E20 N18 E20 S 18 W10

30 0711 E 30 0713 E 30 0851 30 0916 30 0932 30 0945 30 0950 30 1023 E 30 1031 30 1104 E 30 1148 E 30 1243 30 1243 30 1249 30 1325 3 C 1328 30 1330 E 30 1425 30 1425 30 1525 30 1546 E 30 1547 30 1551 E 30 1650 30 1725 30 1729 30 1800 30 1807 30 1817 30 1825 30 1847 30 1847 30 1915. 30 1916 30 1918 E 30 1918 30 2030 30 2032 30 2047 30 2050 30 2050 30 2100 3C 2110 30 2110 30 2122 30 2155 30 220? 33 2206 30 2210 30 2240 30 2320 30 2335

N22 E20 N20 E16 N14 E14 516 E42 N22 E20 S15 E45 S15 E37 N21 E16 514 E43 N21 E16 N20 E14 N30 E35 N29 E35 S18 E33 515 E34 517 E33 516 E30 516 E37 S15 E29 N15 Ell 517 E 34 518 E 31 514 E32 N24 E12 515 E32 515 E 31 N14 E08 N15 E09 N12 E10 516 E27 S13 E37 S16 E35 N15 E06 N21 E10 N2C £10 N20 -12 S16 E27 S16 E25 S16 E27 S16 E25 N14 EO8 N13 E08 N1 5 E08 N14 E08 S16 E28 N17 E 1 5 S15 E26 S15 E28 N15 EO7 N16 E15 S15 E28 N15 EO 5

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1957

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INTERVALS OF NO FLARE PATROL OBSERVATIONS July 1957

HOUR-UT

0 I 2 3 4 5 6 7 8 9 10 I I 12 13 14 15 16 17 18 19 20 21 22 23 24

Stations included:

Anacapri (Swedish)

Arcetri

Climax

Dunsink

Greenwich Royal Observatory,

Herstmonceux

Hawaii

Huancayo

Kodaikanal

Krasnaya Pakhra

Meudon

Mitaka

Nizamiah

Ondrejov

Ottawa

Royal Observatory, Edinburgh

Sacramento Peak

Simeis

Sydney

Uccle

U. S. Naval Research Laboratory

Utrecht

Zurich

Hit

IONOSPHERIC EFFECTS OF SOLAR FLARES

(SHORTWAVE RADIO FADEOUTS)

APRIL 1958

Start End Type Wide Impor- Observation Stations Known April UX UT Spread tance Flare, UT

1958 Index CRPL-F

1 1020 G-SWF 1 2 KU 1018 1 1055 1133 S-SWF 5 2+ NE, PR, SW, CW$$* 1052E 1 1633 1655 S-SWF 5 2 BE, HU, JU, MC, PR 1630 1 2350 0030 S-SWF 5 2 AD, CA, TO

2 0421 0455 Slow-S-SWF 5 2 CA, KO, OK, TO 0427

2 0459 0613 S-SWF 5 2+ AN, CA, KO, NE, OK, TO 0502E 2 1507 1537 G-SWF 4 2 MC, PR, PU 1516E 2 1545 1607 S-SWF 5 2 BE,HU, JU, KU, MC, NE, PR, PU, SW, TO, CW** 1533E 2 1610 1620 S-SWF 5 1 BE, HB, MC, PR, PU, TO, CW* 1605E 2 1650 1710 S-SWF 4 1+ BE, HU, MC, PR 1641

2 1810 1838 S-SWF 5 1+ BE, HU, MC, PR 1807 2 1952 2022 S-SWF 5 2 AD, AN, BE, HU, MC, PR, WS 1951 3 0419 0500 S-SWF 5 2 NE, OK, CW+

PU, CW&* 0412E

3 0820 0900 S-SWF 3 2 0817

3 1440 1515 Slow-S-SWF 5 1+ BE, KU, MC, NE, PR, PU, WS 1435

3 1833 1900 Slow-S-SWF 5 1 AN, BE, KU, MC, PR 1828 4 0318 0339 S-SWF 4 2 NE, TO

5 0805 O856 S-SWF 1 1 NE 0806 5 1352 1423 Slow-S-SWF 4 2- BE, MC, PR 1352 5 1930 2000 Slow-S-SWF 5 1 BE, HU, MC, PR, WS 1925

5 2020 2100 G-SWF 5 1- BE, HU, MC, PR, WS 2020 6 1057 1117 Slow-S-SWF 3 2 JU, NE * 6 1703 1723 Slow-S-SWF 3 1 BE, MC, PR

7 0730 0750 Slow-S-SWF 5 2 OK, PU

7 1016 1125 S-SWF 5 2+ BE, MA, NE, SW, CW®* 1016E

7 2342 0010 S-SWF 3 1+ AD, AN 2336 8 0306 0415 S-SWF 3 1+ OK, TO 0301 9 0823 0902 S-SWF 3 1+ NE, PU 0852E 9

10 1435 0040

1520 0112

G-SWF S-SWF

4 5

1+ 2

BE, MC, PR, PU

AD, CA, OK, TO 1435 0052E

10 0841 093 0 S-SWF 1 1 NE 0859 10 1616 1700 S-SWF 5 2 BE, HU, MC, NE, PR, PU, WS 1548E 10 2218 2258 S-SWF 5 2+ AD, AN, BE, CA, MC, PR, TO, WS 2217 11 0147 0211 Slow-S-SWF 5 1 AD, CA, OK 11 0515 0540 S-SWF 5 1+ CA, KO, NE, OK, TO, CW*

11 0820 0834 S-SWF 5 2- JU, Kfc, PU 11 1150 1210 S-SWF 5 1 BE, DA, PU 11 1255 1308 S-SWF 1 2 PU * 11 1333 1411 S-SWF 5 3- BE,DA,HU,JU,MA,MC,NE,PR,PU,SW,WS,RCA*,CW*** 11 1603 1616 Slow-S-SWF 3 1 BE, MC, PR

15 0709 0731 S-SWF 4 2 KO, PU 0709E 15 0933 0955 S-SWF 3 2+ JU, PU 0925E 16 0534 0608 S-SWF 5 2+ JU, KO, OK, NE, PU, TO 16 1014 1052 S-SWF 3 2 NE, PU 1016 22 0837 0852 S-SWF 1 2 PU 0827E

24 1900 1950 G-SWF 3 1 BE, MC, PR 26 1052 1105 S-SWF 5 2- BE, JU, KU, NE, PR, PU, SW, CW®* 1047 27 0753 0806 S-SWF 1 2 PU 0745 27 1455 1530 G-SWF 3 1- BE, MC, PR 1458 28 0003 0025 S-SWF 5 1 AD, CA, OK 0002E

COMMERCE STANDARDS - BOULDER

lllu

IONOSPHERIC EFFECTS OF SOLAR FLARES

(SHORTWAVE RADIO FADEOUTS)

APRIL 1958

April

1958

Start

UT

End UT

Type Wide Spread Index

Impor¬

tance Observation Stations Known

Flare, UT CRPL-F

28 0527 0607 S-SWF 5 2 JU, OK, TO 0527E 29 1152 1222 Slow-S-SWF 4 1+ MA, NE, PR 1128 29 1855 2020 Slow-S-SWF 5 3- BE, HU, MC, PR, WS 1855E 30 0805 0909 S-SWF 3 2 JU, PU 0804 30 0911 0928 S-SWF 1 2 pu 0905

30 1547 1610 S-SWF 5 1 BE, HU, MC, PR, PU 1545 30 1624 1640 S-SWF 2 1- MC, PR 1615E 30 1652 1715 S-SWF 4 1- AN, HU, MC, PR I65O 30 1835 1915 Slow-S-SWF 5 2 AD, AN, HU, MC, PR, WS 30 1935 1955 S-SWF 4 1 MC, PR, WS 1930

COMMERCE - STANDARDS • BOULDER

SW=Enkoping, Sweden

TO=Hiraiso Radio Wave Observatory, Japan CW* =Cable and Wireless, Barbadoes CW** =Cable and Wireless, Somerton, England CW***r=Cable and Wireless, Brentwood, England

CW+ =Cable and Wireless, Hong Kong RCA* =RCA Communications Inc., Riverhead, N.Y.

PU=Prague. Czech.

*No known flare patrol at this time.

CA=Canberra, Australia

DA=Darmstadt, G.F.R. JU=Juhlesruh, G.D.R.

KO=Kodaikanal KU=Kuhlungshorn

MA=Madrid, Spain NE=Nederhorst den Berg, Netherlands.

I Va

SOLAR RADIO EMISSION

OUTSTANDING OCCURRENCES

MAY 1958

OTTAWA 2800 MC

May 1958

Type* Start UT Duration Maximum Remarks

Hrs :Mins Hrs:Mins Time UT Peak

hrs :Mins Flux

l 2 Simple 2 10 40 2.5 10 41 70 l 6 Complex 14 07 14 14 14.5 14 l 3 Simple 3 16 45 40 17 05 7 l 3 Simple 3 A 17 45 2 30 indet. 13

2 Simple 2 17 51 1.8 17. 51.4 10

2 Simple 2 18 12 8 18 15 11 1 3 Simple 3 A 21 02 15 21 07 9

2 Simple 2 21 02 3 21 03 19 l 3 Simple 3 A 21 27.9 >2 32 21 57 25

2 Simple 2 f 21 27.9 5 21 28.5 136

2 i Simple 1 22 26 4 22 28 7 3 2 Simple 2 13 04.3 6 13 05.5 16 3 6 Complex 19 53 9 19 54.2 18 3 6 Complex 22 08 8 22 09 37 3 2 Simple 2 23 31.5 2 23 32.2 15 in interference

4 6 Comples f 16 41.8 8 16 43.9 64 4 Post increase 10 7

4 6 Complex 20 56 4 20 57.5 19 4 2 Simple 2 22 09.5 6 22 11.2 13 5 2 Simple 2 12 06.5 3 12 07.5 10

5 6 Complex £ 13 26.2 20 13 29 25 5 3 Simple 3 A 18 15 >5 45 indet. 25

1 Simple 1 18 19 2.5 18 20 5 6 Complex f 20 34.7 7 20 36.5 580 4 Post increase 15 8

6 1 Simple 1 16 53.3 1 16 53.8 4 7 2 Simple 2 20 07.9 4 20 09 12 7 1 Simple 1 21 55 1 21 55.4 7 8 2 Simple 2 14 37.7 1 14 38.1 8

10 1 Simple 1 21 54.5 3 21 55.8 6

11 2 Simple 2 21 00.8 1.5 21 01.3 12 12 6 Complex 14 05 5 14 05.5 7 12 6 Complex 23 50.8 2.5 23 51.4 53 in interference 13 2 Simple 2 16 20.3 1 16 20.8 24

4 Post increase 11 5

13 2 Simple 2 18 00.5 3 18 02 9 17 3 Simple 3 A 13 50 10 indet. 5 17 8 Group (2) 13 50.8 5.7

2 S imp le 2 13 50.8 2.5 13 51.6 16 2 Simple 2 13 54.5 2 13 55 10

17 8 Group (2) 18 53.5 8.9 6 Complex 18 53.5 4.5 18 56.4 11 2 Simple 2 19 00.4 2 19 00.9 9

17 3 Simple 3 A 21 36 13 21 40 11 8 Group (2) 21 38 2.8

2 Simple 2 21 38 1.5 21 38.7 15 1 Simple 1 21 40.3 0.5 21 40.5 6

18 2 Simple 2 f 12 23 8 12 25.8 40 18 2 Simple 2 f 19 23.5 5 19 25 15 21 2 Simple 2 16 59.3 2 17 00 8

25 3 Simple 3 A 18 20 35 18 30 5 2 Simple 2 f 18 22.5 1.5 18 23 18

26 6 Complex 17 41.5 3.5 17 42 43 4 Post increase 25 6

30 1 Simple 1 22 23.2 1 22 23.7 7

COMMERCE STANDARDS - S0UL0CR

Va

GEOMAGNETIC ACTIVITY INDICES

APRIL 1958

Apr. 1958

C Values Kp

Sura Ap Final

Selected Days

Three hour Gr. interval 1234 5678

1 1.0 4- 4- 3- 3- 3+ 3+ 4o 4- 27o 19 Five 2 1.2 3+ 4+ 5+ 5o 4+ 5o 4- 3+ 34+ 34 Quiet 3 1.0 4+ 4o 3+ 3- 2+ 2+ 3+ 4- 26o 18 4 1.3 3+ 4- 4- 4- 5- 4o 6- 6- 34+ 36 10 5 1.1 5- 5+ 4o 4- 3+ 3+ 3- 3+ 30+ 26 11

12 6 1.2 4o 3- 3o 4o 3o 4- 3+ 5o 29- 23 13 7 0.8 3+ 4o 3o 3o 3o 3o 3+ 3o 26- 17 22 8 0.4 3- 3- 2- 2- 2- 2o 2+ 3o 18- 9 9 0.3 2+ 3+ lo lo lo 2- 3- 3o 16o 9

10 0.1 1+ lo lo lo lo lo 1+ 2+ lOo 5

11 0.4 2o 2+ 1- 2+ lo 1+ 2- 3o 14+ 7 Five 12 0.1 0+ lo 1- 1+ lo 2o 2o 3- llo 6 Disturbed 13 0.2 2o 1+ 2o lo lo 1+ 2- 2- 12o 6 14 1.0 2- 2o 2+ 4+ 5- 4o 3+ 3+ 26- 20 2 15 1.0 5- 5o 4+ 3o 3- 3- 4- 3+ 29+ 25 4

16 16

1.3 4o 4o 4+ 4o 4o 4o 5- 5o 34o 32 17 17 1.5 6- 5o 4+ 4o 4+ 60 6- 60 41o 54 18 18 1.4 5o 5+ 5- 4o 4+ 5o 5o 5+ 39- 44 19 1.1 4- 3+ 3o 4+ 3+ 4- 4+ 4+ 30o 24 20 0.9 3o 4- 4- 2- 3- 3- 3- 4- 24- 15

21 0.8 2o 3+ 2+ 3- 3- 3o 2o 4+ 22+ 14 Ten 22 0.2 2+ 2+ 2+ 2+ lo 1+ 1+ 0+ 13+ 6 Quiet 23 0.4 Oo Oo 1- 2o 2o 3+ 2o 3o 13o 7 24 0.7 3+ 4o 4- 2o 2o 3+ 2- 3- 23- 15 8 25 0.5 4- 4- 2o 2o 3+ 1+ lo 0+ 17+ 11 9

26 10

0.8 0+ 0+ lo lo 3- 5- 4+ 2+ 17- 13 11 27 0.6 lo 2- 2+ lo 1+ 3o 4- 3o 17o 10 12 28 1.1 3+ 4o 3+ 3+ 4o 4- 4o 5- 30+ 24 13 29 1.2 5- 5+ 4o 4o 4o 4+ 3+ 4- 33+ 31 22 30 1.2 4+ 4+ 4o 3+ 3+ 4+ 4+ 5- 33- 29 23

25 27

Mean: 0.83 Mean: 20


NOTE

September 1957, with its record average Zurich relative sunspot number 244, provided also a record in magnetic activity- Six heavy storms

with sudden commencements. The monthly average of the daily planetary amplitudes, Ap, in the usual unit 2 gamma, was 49. The next highest monthly averages in the available series (1932/33, and 1937 to date) were 40 (Sept 1951) and 37 (March 1940). September had 3 days with Cp = 2.0,

and 5 days with Cp = 1.9. September 4 brought one of the rare Kp = 9o (the five preceding cases of 9o occurred 1941 March 1, July 5 and Sept 19, and 1946 July 27 and Sept 22). The number of three-hour-intervals with high Kp-indices in the 6 months named were-

Number of intervals with Kp = 9o 9- 8+

1 2

1 3 1 7 1 1 3 1 1 2 16 6

1941 March 1941 July 1941 Sept. 1946 July

1946 Sept. 1957 Sept.

Via

CRPL RADIO PROPAGATION QUALITY FIGURES AND FORECASTS

NORTH ATLANTIC

APRIL 1958

North Atlantic Short- •term forecasts Whole Advance forecasts Geomag-

Apr. 6-hourly issued about one day (j-reports) for netic

1958 quality figures hour in advance of: index whole day; issued KFr in advance by:

00 06 12 18 to to to to 00 06 12 18 1-4 4-7 8-25 Half Day 06 12 18 24 days days days (1) (2)

1 6- 5+ 7- 7- 6 5 6 6 6o 6 6 3 3 2 6o 5+ 6+ 7- 5 5 6 6 6o 6 6 (4) (4) 3 6- 6+ 7- 7- 7 6 7 7 6+ 6 6 3 3 4 6+ 7- 6+ 6+ 6 6 7 6 6+ 6 6 3 (4) 5 5o 5o 7- 6+ 6 4 6 6 6- 6 6 (4) 3

6 6o 6- 7- 7- 6 6 7 6 6+ 6 6 3 3 7 6+ 5+ 6-f 7- 6 6 7 6 6o 6 6 3 3 8 7- 6- 7- 6+ 6 6 7 7 6+ 6 6 2 2 9 7- 6+ 7- 6+ 6 6 7 7 6+ 6 6 2 3

10 7- 6+ 7- 7- 6 7 7 7 7- 5 6 1 2

li 7o 6+ 7- 7+ 7 7 7 7 7- 7 5 2 2 12 7+ 6+ 7- 7o 7 6 7 7 7- 7 6 1 2 13 7- 7- 7o 7o 7 6 7 7 7o 7 6 2 2 14 7- 7- 7- 7- 7 7 7 6 7- 7 6 3 (4) 15 6o 5+ 6+ 7- 6 6 6 6 6o 6 7 (4) 3

16 6- 5- 6+ 6o 6 5 6 6 6- 7 7 3 (4) 17 5o 5- 6- 6- 6 4 5 6 5+ 7 7 (5) (4) 18 4+ 5o 6- 6o 5 4 6 6 5o 6 7 (4) (4)

19 6- 6- 6+ 6o 5 5 6 6 6o 6 7 3 3 20 5+ 6- 6+ 6+ 6 6 6 6 6o 6 7 3 3

21 7- 6- 6+ 7- 6 6 7 6 6+ 6 7 3 3 22 7- 6- 7- 7- 7 6 7 7 6+ 6 7 3 1

23 7- 6+ 7- 7- 7 6 7 7 7- 6 7 1 3 24 6+ 6- 6+ 6+ 7 6 7 6 6+ 7 7 3 2

25 6+ 6o 7- 7- 7 6 7 7 6+ 7 7 2 2

26 7o 7+ 7o 7- 7 7 7 6 7o 7 7 1 3 27 7o 7o 7- 7o 6 6 7 7 7o 7 7 2 2 28 7- 6- 6o 6o 7 6 6 6 6o 7 7 3 (4) 29 5+ 5- 6- 6o 6 5 6 5 5+ 6 7 (4) 3 30 5+ 5o 6- 6+ 6 4 6 6 6- 7 7 (4) (4)

Score Quiet Periods P 14 18 23 19 20 12 S 15 12 7 11 8 14 U 0 0 0 0 2 4 F 0 0 0 0 0 0

Disturbed Periods P 0 0 0 0 0 0 S 1 0 0 0 0 0 U 0 0 0 0 0 0 F 0 0 0 0 0 0

( ) represent disturbed values. commerce - standards - boulder

QU

AL

ITY

QU

AL

ITY

QU

AL

ITY


NORTH ATLANTIC

APRIL 1958

VIb

— Short-term forecast I Range of reports

o Quality figure

DAY

OUTCOME OF ADVANCED FORECASTS 1 TO 4 DAYS AHEAD

\+-QUIET-*

i

0 10 20 30

USEFUL FREQUENCY RANGES- NORTH ATLANTIC PATH

APRIL 1958

12. Aprs 05

!3.AFre 05

1—1 1 I 1 -r- ) r- )-T"

9 12 15 18 21 24 COMMERCE STANDARDS - BOULDER

VId

APRIL 1958

C^UT 3 6 9 12 15 18 21 24

COMMERCE • STANDARDS - BOULDER

Adapted from Observations by Deutsches Bundespost


NORTH PACIFIC

APRIL 1958

Apr. 1958

North Pacific

8-hourly

quality figures

Short-

casts

term fore-

issued at

Whole

day

index

Advance forecasts

(jp reports) for

whole day; issued

in advance by:

Geomag¬

netic

KSi

03 to

11

11

to

19

19 to

03

02 10 18 1-4 4-7 days days

8-25 days

Half Day

(1) (2)

1 6 6 6 6 6 6 6 4 5 2 3 2 5 5 6 6 4 6 6 5 5 (5) 3

3 6 5 6 6 5 6 6 5 5 (4) 2

4 6 5 5 6 5 6 5 5 5 (4) (4) 5 6 5 5 5 5 5 5 5 6 (5) (4)

6 5 5 6 5 4 6 5 5 6 (4) (4) 7 6 5 6 6 5 6 6 5 6 (4) 2 8 6 6 6 6 6 6 6 6 6 2 2

9 6 5 6 6 6 6 6 6 6 2 1 10 6 6 6 6 6 7 6 6 6 0 1

n 6 6 7 6 6 6 7 6 6 1 2 12 7 6 6 6 6 7 6 6 7 0 2 13 6 6 6 6 6 6 6 6 7 1 1 14 6 6 5 6 6 6 6 6 7 2 (4) 15 5 6 5 6 6 6 5 6 7 (4) 2

16 5 5 5 6 6 6 5 6 7 (4) (4) 17 5 5 5 5 5 4 5 6 7 (5) (5) 18 5 4 6 5 5 5 5 6 7 (5) (5) 19 5 5 6 5 5 5 5 5 7 (4) 3 20 6 5 6 6 6 6 6 5 7 3 2

21 6 6 6 6 6 6 6 5 7 3 2 22 6 6 6 6 6 6 6 5 7 3 1

23 6 6 6 6 7 6 6 6 5 0 2 24 6 6 6 6 6 5 6 6 6 (4) 2

25 6 6 6 6 6 6 6 6 6 3 1

26 6 7 6 7 7 7 7 6 6 0 3 27 6 6 6 7 7 6 6 6 6 1 2 28 6 5 6 6 5 6 6 6 6 (4) (4) 29 4 5 6 5 4 5 5 7 6 (6) (4) 30 5 6 6 5 5 6 6 4 7 (4) (4)

Score: Quiet Periods P 22 20 17 15 9 S 7 9 13 12 16 U 0 0 0 1 5 F 0 0 0 2 0

Disturbed Periods P 0 0 0 0 0 S 1 1 0 0 0 U 0 0 0 0 0 F 0 0 0 0 0

( ) represent disturbed values. commerce - standards - boulder

Vlf


NORTH PACIFIC

APRIL 1958

OUTCOME OF ADVANCED FORECASTS 1 TO 4 DAYS AHEAD


Vila

ALERT PERIODS AND SPECIAL WORLD INTERVALS

Alert SWI Age On Days of Alert Period Number of Flares of IMP > 2 Issued Ends

1600 UT 1600 UT (SWI Underlined) Reported Promptly on Days of

Alert Period

1958

Apr 30-May 05 23-19-08-06-09-10 1-3-2-1-0-5

COMMERCE - STAND ARM - BOULDER

I I

I

I

I

k - nist · 2017. 11. 30. · crpl-f166 part b . for official use . i n n f’. r\ k . part b ....

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