Observations of the brightness profile of the sun in the 30-200 micron continuum

Details Observations of the brightness profile of the sun in the 30-200 micron continuum Observations of the brightness profile of the sun in the 30-200 micron continuum

Jun 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...281..862l&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 281, June 15, 1984, p. 862-869. Research supported by the Royal Observatory

Astronomy and Astrophysics

Astronomy

8

Brightness Temperature, Chromosphere, Infrared Astronomy, Solar Temperature, Continuous Spectra, Faculae, Far Infrared Radiation, Fine Structure, Limb Darkening, Solar Activity, Spectral Resolution, Stellar Models, Stellar Spectrophotometry, Submillimeter Waves

Scientific paper

The authors observed the brightness profile of the quiet Sun in broad continuum passbands centered at 30, 50, 100, and 200 μm with a resolution of 2arcmin. Weak radial darkening was seen at all four wavelengths near disk center. This reverses to brightening toward the limb in the 100 and 200 μm continuum. Radial darkening at 100 and 200 μm is not expected from smooth model chromospheres consistent with absolute brightness measurements. These results do not support a homogeneous model of the low chromosphere, where the temperature reversal occurs.

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