Computer Science
Scientific paper
May 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984siva.work...97f&link_type=abstract
In NASA, Washington Solar Irradiance Variations on Active Region Time Scales p 97-119 (SEE N84-27635 17-92)
Computer Science
Heat Transmission, Limb Darkening, Photometry, Photosphere, Solar Activity, Solar Limb, Stellar Models, Faculae, Solar Flux, Solar Oscillations, Solar Rotation, Sunspots, Temperature Gradients
Scientific paper
Continuum photometry is carried out and the results of comparing these observations with models of photospheric heat flow are described. The main results are: (1) a possible detection of weak bright rings around some spot penumbrae; (2) no evidence is found for large scale photospheric brightness inhomogeneities exceeding 2-3 K which places tighter constraints on models of global scale convection; (3) supergranular scale continuum structures observed across the photosphere appear mainly due to random clumping of granules; (4) the one case observed of a sunspot emergence shows no thermal shadow exceeding 1.5 K rms one day prior to umbra appearance; (5) network and faculae are found to show a small excess brightness even at mu = 1, so detection of faculae at mu = 1 by differential photometry indicates a gentler temperature gradient near tau = 1 in the facular (relative to cell) atmosphere; (6) the limb darkening study shows no significant global variations to within 0.1% rms.
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