Physics – Space Physics
Scientific paper
May 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996aas...188.6706r&link_type=abstract
American Astronomical Society, 188th AAS Meeting, #67.06; Bulletin of the American Astronomical Society, Vol. 28, p.934
Physics
Space Physics
Scientific paper
NIM-1 is a spectrograph-based Stokes polarimeter for measuring the strength and orientation of magnetic fields in the solar photosphere using two Zeeman-sensitive Fe I lines (g = 3 and g_geff = 1.53) near 1565 nm. NIM-2, now under construction, also uses these spectral lines but is based on a high-resolution Fabry-Perot etalon. NIM-2 will eliminate the image scanning and consequent spatial distortions of NIM-1 and will be compact and light enough to serve as a prototype for balloon or space instruments. The Queensgate etalon will provide a spectral resolving power of 10(5) over a 1-nm free spectral range. The initial detector will be the 256(2) InSb array shared with NIM-1, but NIM-2 is designed to accommodate a 512(2) or 1024(2) ``Aladdin'' InSb array. The data system, also shared with NIM-1, is being upgraded to handle the faster switching speed ( ~ 8 ms) of improved liquid-crystal variable retarders. NOAO is operated for the NSF by the Association of Universities for Research in Astronomy. Near-infrared magnetometry at NSO is supported by the the NASA Space Physics Division through the SR&T program in solar physics.
Jaksha David
Keller Ch.
Rabin Doug
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