Solar cycle variation of sunspot intensity

Details Solar cycle variation of sunspot intensity Solar cycle variation of sunspot intensity

Jun 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981soph...71..269a&link_type=abstract

Solar Physics, vol. 71, June 1981, p. 269-283. Research supported by the Norges Almenvitenskapelige Forskningsrad.

Physics

49

Astronomical Photometry, Solar Cycles, Solar Physics, Sunspot Cycle, Chronology, Penumbras, Periodic Variations, Solar Limb, Solar Observatories

Scientific paper

Broad band pinhole photometer intensity observations of 15 large sunspots encompassing the spectral region 0.387-2.35 microns are presented. The data derive from measurements on approximately 500 days between June 1967 and December 1979. Real and significant intensity differences between large sunspots are found. It is thought that these differences may be explained by a systematic variation in the umbral temperature throughout the solar cycle. A connection is discussed between umbra intensity and heliographic latitude. No center-limb variation is detected in the umbra/photosphere intensity, and no significant correlation is found between umbra intensity and a number of other sunspot parameters, such as spot size. It is concluded that the umbra/photosphere intensity ratio seems to be a unique function of epoch for large sunspots.

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