Other
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...210.2520l&link_type=abstract
American Astronomical Society Meeting 210, #25.20; Bulletin of the American Astronomical Society, Vol. 39, p.134
Other
Scientific paper
The brightness (I) and magnetic field (B) distributions (I-B relationship) of sunspots are closely related. Several previous studies show that the relationship depends on the spot size, disk position, life time, and phase of the solar cycle in which it appears. The I-B relationship might also change from cycle to cycle. Many of the previous studies were conducted by single position measurements over the spot. Here, we present the results of a study of the I-B relationship using a uniform set of imaging observations of about 272 sunspots over the last two solar cycles at the San Fernando Observatory. The corresponding full disk magnetograms are from MDI-SOHO. The first result to be presented is the I-B relationship of sunspots. The second result is from an examination of the linear part of the I-B relationship, which shows that larger spots have a stiffer dependency compared to small spots. Another such dependency is more pronounced for the spots with a large umbra-penumbra ratio. Furthermore, the spots closer to the disk center have a stiffer I-B slope compared to the spots situated towards the limb. Finally, we explore the I-B properties of spots in relation to their corresponding solar hemispheres, as a function of their evolution history, dependence on their magnetic polarity, and any dependency on solar cycle. This work was partially supported by Cottrell College Science Award CC6496.
Choudhary Debi Prasad
Leonard Trevor W.
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