Opportunities for Joint SOT – Ground Based Observations Using NSO/Tucson Facilities

J. Harvey, NSO

Current NSO/T Facilities

McMath-Pierce SOLIS VSM

GONG

McMath-Pierce and SOT

McMath-Pierce Facility

• 1.52 m and two 0.81 m aperture telescopes

• Powerful grating spectrographs

• Emphasis on infrared and user observations

Facility Instruments (used with spectrograph)

• Infrared Adaptive Optics System (IRAO)

• Near Infrared Magnetograph 1-5 micron (NIM-2)

• NSO Array Camera 1-5 micron (NAC)

Observables

Temperature, velocity, vector magnetic field in active region-sized areas using unique infrared diagnostics (He I, Fe I, Ti I, CO, MgH, etc.) photosphere to low chromosphere.

SOLIS VSM and SOTSOLIS VSM Facility

• 50 cm, f/6.6, full-disk, low-polarization spectropolarimeter

• 2300 x 1.13 arc sec, dual-beam slit spectrograph

• Equatorially mounted, driven N-S to scan Sun

• Liquid-crystal polarization modulators (46 and 23 Hz)

• Optimized for 630, 854 and 1083 nm spectral lines

Daily full-disk observations

• 3 photospheric vector magnetograms (24 min each)

• 1 chromospheric longitudinal magnetogram (40 min)

• 1 deep photospheric longitudinal magnetogram (12 min)

• 3 helium 1083 nm spectroheliograms (12 min each)

Time available for collaborative observations

SOLIS VSM and SOT SPStokes I,Q,U,V spectra

Parameter SOT SP SOLIS VSM

slit size 0.16 x 164" 1.13 x 2300"

scan range ≤ 320" ≤ 2300"

spectral range nm 630.08 – 630.32 630.00 – 630.36

spectral sample 21.5 mÅ 28 mÅ

polarization noise 10-3 <10-3

‘normal’ step 0.16" in 4.8 sec 1.13" in 0.7 sec

‘normal’ scan 160" in 83 min 2300" in 24 min

VSM faster for same area but 7X worse resolution -- useful for spatial and temporal context?

SOLIS VSM and SOT NFIphotospheric longitudinal magnetogram

Parameter SOT NFI SOLIS VSM

spectral line (nm) 630.25 630.25 & 630.15

area 82 x 164" 81 x 2300"

pixel 0.08" 1.13"

spectral samples 4 x 90 mÅ 128 x 28 mÅ

scan time 21 sec 25 sec

rms noise/pixel 1015 Mx 1015 Mx

VSM complementary but 14X worse resolution -- useful for spatial and temporal context?

GONG and SOT

GONG Network, Instrument and Data

• 6 synchronized stations around the world

• 2.5 arc sec pixel full-disk images using 676.8 nm Ni I

• Phase-shift interferometer modulated at 20 Hz

• 1/min intensity, velocity and longitudinal magnetogram

Near-real time products (<24 hr)

• Synoptic maps from 10 min cadence LOS magnetograms

• Far side images from 1 min cadence low resolution velocity

Later data products (>24 hr)

• Subsurface flow maps

• Full-resolution, 1/min intensity, velocity, magnetic field

NSO Policy and Solar-B

“NSO is developing plans for support of Solar-B science objectives. We will develop a scheme for giving high priority to requests for coordinated observations at the Dunn Solar Telescope and McMath-Pierce Solar Telescope. Special requests for non-standard SOLIS observations will also be considered, and our Air Force partners have indicated that a similar policy will be available for the Optical Solar Patrol Network (O-SPAN) (formerly the Improved Solar Observing Optical Network, ISOON) telescope at Sacramento Peak.”

-- S.Keil, March 2006 NOAO/NSO Newsletter

Sample Data

SOLIS VSM2004 January 6

SOLIS VSM

Field strengthAzimuth in sky planeInclination to line of sight

SOLIS VSM Vector Magnetogram

SOLIS VSM Photo/Chromo Magnetograms

SOLIS VSM

SOLIS VSM 1083 nm He I

SOLIS VSM Coronal Hole Map

GONG White Light FlareGONG TRACE WL BBSO

HaTRACE 1600 A

19:43:03 – 19:44:03

20:02:03 – 20:03:03

20:20:03 – 20:21:03

19:43:17

20:02:30

20:20:40

19:43:56

20:02:26

20:20:56

19:43:46

20:02:59

20:21:08

GONG Flare Magnetic Field Change