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USAF/NSO Improved Solar Observing Optical Network (Prototype)
PI Instrument And Archive
Limited data available via www.nso.edu, for specific research. ISOON is presently undergoing transition, and data is sporadic. Collaborative research encouraged.
Solar Instruments
The Improved Solar Observing Optical Network (ISOON) is project is a collaboration between the Air Force Research Laboratory Space Vehicles Directorate and the National Solar Observatory. ISOON is a semi-autonomous, remotely commandable patrol telescope designed for studies of solar activity in support of space weather specifications and forecasts. ISOON can receive and analyze solar images and other data at a remote location -- in essence, forming a desktop solar observatory. The system was originally planned to consist of three identical telescope sites around the world, with communication links to a central command and analysis facility. Presently, ISOON is limited to a single site, at the National Solar Observatory at Sacramento Peak, in southern New Mexico. ISOON acquires solar images in the hydrogen-alpha line (once per minute), in continuum (once every ten minutes), and in line-of-sight magnetic fields. Additional images or alternate observing sequences are programmable options. Images are passed through an automatic image processing pipeline (see Image Processing) and are subsequently analyzed and displayed using various software tools (see Analysis Functions).
K. S. Balasubramaniam
Spectral Rangevisible
Spectral ResolutionDepends on spectral region 60 - 120 mA
Spatial Coverage and Resolution1.1arcsecond pixels in low-res
Temporal Resolution1 image every minute at H-alpha line-center
Data Accuracyphotometric quality within 5%
Data PrecisionN/A
Physical ObservablesHalpha line-center images Halpha +0.4 A, -0.4 A images HeI 10830 Images White-light true continuum images
Derived OutputsN/A
Concurrence OpportunitiesN/A
Expected LifetimePI Driven and funding dependent
Location or OrbitNSO/Sac Peak
Capability SummarySystem Specifications * Telescope: o 250-mm aperture, polar-axis, evacuated refractor, primary focal length 5000 mm * Instrumentation: o Dual Fabry-Perot filters (150 mm aperture) o Polarization analyzer (Stokes I, Q, U, and V are observable) * Detector: o 2048 x 2048 CCD, cooled, 12-bit, 14 micron pixels, 200,000 electron well depth * Magnetograph: o Doppler-Zeeman algorithm, upgradable to vector * Standard Wavelengths Observed: o Hydrogen-alpha, tunable to +/- 4 Angstroms o Continuum (vicinity of 6122 Angstroms) * Bandpass: o 0.1 A (0.1 - 0.25 A depending on observing mode and effective aperture) * Pixel Size: o 1.1 arcsec full disk mode o 0.32 arcsec high resolution mode * Standard Cadence: o 1 hydrogen-alpha image per minute * Photometric Accuracy: o Better than 5% over the field, 4096 intensity levels
SchedulingRegular observing all day - Patrol instrument, weather permitting
Archival DataDaily data from 2002 - present, except weekends, holidays, and cloudy days. Data could be sporadic due to maintenance and transition issues
Number of UsersN/A
Planned UpgradesNetowrk
Data Productssee above
University FacilityNo
National Ground BasedYes
Virtual ArchiveNo
The USAF Improved Solar Observing Optical Network (ISOON) and its Impact on Solar Synoptic Data Bases. Neidig et al. 1998, ASP Conference Series; Vol. 140; 1998; ed. by K. S. Balasubramaniam; Jack Harvey; and D. Rabin, p.519
22 Sep 2009 13:54