a major proton event of 2005 january 20: propagating supershock or superflare?
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A major proton event of 2005 January 20: propagating supershock or superflare?. V. Grechnev 1 , V. Kurt 2 , A. Uralov 1 , H.Nakajima 3 , A. Altyntsev 1 , L. Kashapova 1 , N. Meshalkina 1 et al. 1 Institute of Solar-Terrestrial Physics, Irkutsk 2 Moscow State University, Moscow - PowerPoint PPT PresentationTRANSCRIPT
NBYM 2006
A major proton event of 2005 January 20:
propagating supershock or superflare?
V. Grechnev1, V. Kurt2, A. Uralov1, H.Nakajima3, A. Altyntsev1, L.
Kashapova1, N. Meshalkina1 et al.
1Institute of Solar-Terrestrial Physics, Irkutsk2Moscow State University, Moscow
3Nobeyama Radio Observatory, Nobeyama
The event of 2005 January 20
Speedest (>5000 km/s) CME ever registered with LASCO @ 4.4R (06:54 UT)
Protons >700 cm-2s-1sr-1
with E>100 MeV came soon
GLE of 277 %, largest in the 23th cycle
-ray emission X7.1/2B Microwave flux ~ 105 sfu SXR
Protons
Problem in question Gopalswamy et al. (2005, 29th ICRC,
101): common shock origin for type II radio bursts and GLEs
Simnett (2006, A&A 445, 715): CME was not responsible for the relativistic ion acceleration
¿Where high-energy protons were accelerated?
Available data The event observed in X-rays and -rays:
Reuven Ramaty High-Energy Solar Spectroscopic Imager (RHESSI)
non-imaging Solar Neutron and Gamma spectrometer (SONG) on board CORONAS-F spacecraft from 06:43:30 on
-rays up to 100 MeV TRACE in 1600 Å line from 06:53:30 on Nobeyama Radio Polarimeters (NoRP) No NoRH observations (too late)
HXR and -ray time profiles
TRACE
RHESSISONG
HXR and -ray time profiles
RHESSI/HXR & SXR, TRACE 1600 Å
Background: TRACE 1600 Å. No images between 06:18 and 06:52:30
Red: RHESSI SXRBlue: RHESSI
HXR (50-100 kev?)
GOES/SXI:
Movie: http://svs.gsfc.nasa.gov/vis/a000000/a003100/a003161/
Comparison of TRACE 1600 Å and HXR 50-100 keV images
One can expect correlation of bright kernels in TRACE 1600 Å and HXR
This can be used for coalignment The interval of 06:52:30-06:57 Variance and averaged images
06:52 06:5706:47
Ribbons in TRACE 1600 Å images
Variance map
Time profiles
Averaged image
Outcome from TRACE 1600 Å images:
8 bright kernels at the outer parts of ribbons
4 regions with well-pronounced counterparts 4 loops: Formation of a usual (low) arcade
Try to compare with RHESSI 50-100 keV images
Comparison of 1600 Å and HXR bright kernels
White: 50-100 keV kernels Black: 1600 Å kernels Bottom: shift +7.5, -10.5 satisfactory coalignment
Now we can find relative positions of sunspots, ribbons, and X-ray sources
Relative positions of sunspots, ribbons, and X-ray sources
Ribbons crossed sunspots Large SXR loop-like structure
White Light
6-12 keV
50-100 keV
1600 Å ribbon
50-100 keV RHESSI images
N-footpoint fixed S-footpoint moves
eastwards HXR are weaker
from N-footpoint BN-foot > BS-foot,
N-footpoint needs more counterparts
N
S
Evolution of AR 10720 Magnetograms:
one week of SOHO/MDI observations, Jan 12-20
All images “co-rotated” to Jan 15, 00 UT
B > 2000 G in N-polarity sunspot
B = 1800 G
overturn
NoRP dataNote: Y scales in 103 sfu
Stokes I
Stokes V
Source A
Source B
NoRP spectra
peak, GHz
Flu
x,
10
3
sfu
Frequency , GHz
NoRP data suggest
Source A: 35 GHz < peak < 80 GHz in N-sunspot, B > 2000 G
Source B: peak < 35 GHz in S-polarity region, first in weaker sunspot, then moved eastwards
One or two more sources in weaker magnetic fields -(0.6-1.3) 1.8-2.5
Microwave emission was produced by large amount of hard electrons in strong magnetic fields
Source BSource A
SXR GOES data
Loop: h=50 Mm, l=2.6 Mm, d=0.9 Mm, V=8·1027 cm3
Neupert effect & trapping:
GOES 12
GOES 10
GOES/SXI
300-800 keV
34 GHz
17 GHz
d/dt(GOES 1-8 Å)
Ne
T
EM
Features of the event Long bundle of loops rooted in
sunspots Trapping & harder microwaves large
mirroring expectable in a large loop Many accelerated particles (estimated
from microwave fluxes) Strong magnetic fields
HXR & -ray images and spectrum
= 2.7 – softer than microwaves suggest
Nuclear lines 0.51 & 2.2 MeV
All images are confined to the active region
Ground-Level Enhancement
Perfect coincidence No dispersion with respect
to -rays Delay of ~380 s Solar wind disturbed (ACE:
~800 km/s) - path length longer
Leading edge was a bunch of ultrarelativistic protons
Conclusion 2.2 MeV line is due to collisions of MeV-energy
protons with dense layers The 2.2 MeV source image is located in region of
closed magnetic structures Protons from remote outer source have no
access into the closed structures in AR
Protons could be accelerated only in AR
On the other hand, protons accelerated in the current sheet are injected both down and up, and the latter reach the Earth to produce GLE
Was this event exceptional?
Date Peak 35 GHz 80 GHz Protons GLE Position Flare L&B Gopal1990-04-15 02:59 19615 No data N32E57 X1.41990-05-21 22:14 37913 29083 + + N35W36 X5.5 + 1991-03-22 22:44 122522 12469 + S26E28 X9.4 + 1991-03-29 06:45 10871 2196 ? S28W60 X2.41991-05-18 05:13 20429 3376 ? N32W85 X2.81991-06-04 03:41 131163 165816 + N30E65 X12 + 1991-06-06 01:08 130439 186980 + N33E44 X12 + 1991-06-09 01:38 73994 23630 + N34E04 X10 + 1991-06-11 02:05 45671 10025 + + N31W17 X12 + 1991-10-24 02:38 33967 10637 S15E60 X2.11992-11-02 02:49 41312 12000 + 15% S23W90 X9 + 2001-04-02 21:47 24952 15600 Weak 1% N17W78 X202002-07-23 00:30 14821 6000 S13E72 X4.82002-08-24 01:00 11477 4300 + 5% S02W81 X3.1 +2005-01-20 06:46 84500 50000 + 277% N14W61 X7.1 +2000-11-08 23:28 weak weak strong N20W66 M7.4 + 2001-04-18 02:14 48 + 14% S23W92 C2.2 +2001-12-26 05:05 764 111 + 7% N07W62 M7.1 +
F35 > 104 sfu 15 of 649 events
Summary High-energy protons in 2005 January 20 event
were accelerated on the Sun, within the active region
2005 January 20 event was a major proton flare
Moreover, it was a typical major proton flare
Microwave emission in such events is generated by large number of electrons with hard spectrum in strong magnetic fields
We acknowledge
Shibasaki San and NSRO for the opportunity to work here under perfect conditions
Staff members of the NSRO for the hospitality