The center-to-limb brightness variation of the sun at lambda = 850 microns

Details The center-to-limb brightness variation of the sun at lambda = 850 microns The center-to-limb brightness variation of the sun at lambda = 850 microns

Sep 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...415..364b&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 415, no. 1, p. 364-375.

Astronomy and Astrophysics

Astrophysics

12

Brightness Distribution, Local Thermodynamic Equilibrium, Solar Activity, Solar Atmosphere, Solar Limb, Chromosphere, Solar Radio Emission

Scientific paper

The 10.4 m submillimeter telescope of the Caltech Submillimeter Observatory was used to map the full disk of the sun on July 9-10, 1991 at a wavelength 850 microns with an angular resolution of 20.6 arcsec. A maximum entropy-type deconvolution was performed to correct the map for the broad wings of the telescope beam. The brightness distribution of the resulting map shows (1) a high degree of correlation with corresponding images in H-alpha, the Ca II K line, and with the photospheric magnetogram; (2) a systematic center-to-limb brightening of the quiet sun (about 12 percent at an offset of 0.94 solar radius) with no apparent difference in the limb brightening between the EW and NS quadrants; (3) an average contrast of about 11 percent between active region plages and the quiet sun near disk center; and (4) a smaller degree of center-to-limb brightening of active region plages (about 5 percent at an offset of 0.94 solar radius), leading to a decrease in contrast between active region plages and the quiet sun from the center to limb. We compare the observed center-to-limb brightness variation of the quiet sun and plages with that expected for several chromospheric models, including those which include a 'spicular' component. We find that although the observed center-to-limb variation of the quiet sun at 850 microns is broadly consistent with the chromospheric models of Vernazza et al. (1981), it differs in detail.

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