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