Intensity and Magnetic Field Distribution of Sunspots

Details Intensity and Magnetic Field Distribution of Sunspots Intensity and Magnetic Field Distribution of Sunspots

Oct 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008soph..252...33l&link_type=abstract

Solar Physics, Volume 252, Issue 1, pp.33-41

Physics

2

Sun: Magnetic Field, Sun: Sunspot, Sun: Brightness

Scientific paper

We study the relationship between the brightness ( I) and magnetic field ( B) distributions of sunspots using 272 samples observed at the San Fernando Observatory and the National Solar Observatory, Kitt Peak, whose characteristics varied widely. We find that the I B relationship has a quadratic form for the spots with magnetic field less than about 2000 G. The slope of the linear part of the I B curve varies by about a factor of three for different types of spots. In general the slope increases as the spot approaches disk center. The I B slope does not have a clear dependency on the spot size but the lower limit appears to increase as a function of the ratio of umbra and penumbra area. The I B slope changes as a function of age of the sunspots. We discuss various sunspot models using these results.

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