Limb-darkening and solar cycle variation of sunspot intensities

Details Limb-darkening and solar cycle variation of sunspot intensities Limb-darkening and solar cycle variation of sunspot intensities

Jan 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984soph...90...17a&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 90, Jan. 1984, p. 17-30. Research sponsored by the Norges Almenvitenskapelige Forskningsrad

Physics

36

Band Ratioing, Limb Darkening, Solar Spectra, Sunspot Cycle, Umbras, Brightness Temperature, Photosphere, Radiant Flux Density, Solar Temperature

Scientific paper

New observations of the umbral limb-darkening are presented. A real and significant decrease in the umbra/photosphere intensity ratio towards the limb is found. This result contrasts the findings of previous authors and is believed to be the first time such a decrease is reported. The conclusion reached is based on broadband pinhole photometer intensity observations of 22 large sunspots covering the spectral region 0.387-2.35 microns. The data are selected from measurements on approximately 600 days during the last 15.5 yr. The application of the limb-darkening data to the study of the temperature stratification in the umbra is briefly discussed. The observations confirm the suggestion that the umbra/photosphere intensity ratio seems to be a linear function of the phase in the solar cycle.

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