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He 10830 A Video Filtergraph/Magnetograph (1Dec93)
(from NSO, NOAO Newsletter No. 36, 1 December 1993)

A new instrument for high spatial and temporal resolution imaging of
solar active regions and flares in the 10830 A line of He I is being
developed under the Memorandum of Agreement between AURA and NASA/GSFC
for use at the NSO/Kitt Peak Vacuum Telescope. The He 10830 A Video
Filtergraph/Magnetograph will be able to run simultaneously with the
spectromagnetograph and will provide a unique view of solar structure
and activity since the line is formed entirely in the high chromosphere
but also responds to EUV radiation from overlying, higher temperature
regions of the atmosphere. The instrument is based on a five-element
Lyot filter which provides differential dual bandpass response and
polarization modulation. With the help of NASA/GSFC, detailed design
and assembly drawings were completed in the past year, and the
instrument was fabricated in the NOAO shop. The data system and its
associated software are in place. Assembly, electrical cabling, and
final software development are in progress, and the instrument should
be installed at the KPVT late in 1993 or early in 1994.

Jack Harvey, Harry Jones

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