On the decay rate of sunspots

Details On the decay rate of sunspots On the decay rate of sunspots

Feb 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30d..27c&link_type=abstract

Geophysical Research Letters, Volume 30, Issue 4, pp. 27-1, CiteID 1178, DOI 10.1029/2002GL016225

Astronomy and Astrophysics

Astrophysics

3

Solar Physics, Astrophysics, And Astronomy: Solar Irradiance, And Astronomy: Solar And Stellar Variability, And Astronomy: Stellar Interiors And Dynamo Theory

Scientific paper

We have analyzed the decay of 32 sunspots observed during the years 1988 through 2001 at the San Fernando Observatory (SFO). The data are from digital images obtained in the red (672 nm) with the Cartesian Full Disk Telescope No.1 (CFDT1). We find that the rate of decay is strongly correlated with the total sunspot area and the umbral to total area ratio. The multiple correlation coefficient is 0.93. Thus, the unexplained variance from this simple model is (1-0.87). We find that for the sunspots of this study, the decay rate is not a constant and that there is no significant correlation between the decay rate and the square root of the total spot area.

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