Solar limb brightening at 350 microns

Details Solar limb brightening at 350 microns Solar limb brightening at 350 microns

Sep 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...248..830l&link_type=abstract

Astrophysical Journal, Part 1, vol. 248, Sept. 1, 1981, p. 830-835.

Astronomy and Astrophysics

Astronomy

13

Infrared Astronomy, Limb Brightening, Solar Flux Density, Solar Limb, Submillimeter Waves, Chromosphere, Infrared Telescopes

Scientific paper

The NASA Infrared Telescope Facility at Mauna Kea was used to observe the intensity profile of the quiet solar limb in the 300-400 micron continuum. A significant resolved brightening of several percent over the outer 60 arcsec of the solar limb in this band is found. However, the magnitude of the brightening is considerably less than that indicated by earlier observations of a total solar eclipse in integrated sun-moon radiation by Beckman, Lesurf, and Ross (1975) in the 1.2 mm continuum. More recent ground-based observations indicate that the magnitude of solar limb brightening at 800 microns and at 1.3 mm is stronger than that at 350 microns. This may be regarded as an indication that the hot material which produces the brightening at the extreme limb, thought to consist in part of chromospheric spicules, is optically thin in the 350 micron continuum.

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