Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aas...181.9406k&link_type=abstract
American Astronomical Society, 181st AAS Meeting, #94.06; Bulletin of the American Astronomical Society, Vol. 24, p.1270
Astronomy and Astrophysics
Astronomy
Scientific paper
We present nearly full-disk, diffraction-limited solar images made at 350 and 850 microns and at 1.3 mm from the 15 m James Clerk Maxwell Telescope on Mauna Kea. These wavelengths sample the thermal structure of the solar chromosphere at altitudes from 500 to about 1500 km, providing a height-dependent diagnostic of the atmosphere. Filament channels and neutral lines are apparent in the submillimeter images, although filaments themselves are not clearly visible. The submillimeter images show plage approximately 20% brighter than the surrounding quiet Sun, while sunspot intensities are comparable to the quiet Sun. ``Circumfacules,'' dark areas surrounding active regions, are observed in the submillimeter images and are similar to those seen in Ca 8542; comparison with Ca H and K may give estimates of the temperature and filling factor of the hot gas present in these probably bifurcated regions.
Köpp Gene
Lindsey Charles
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