Physics
Scientific paper
May 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011soph..270...75h&link_type=abstract
Solar Physics, Volume 270, Issue 1, pp.75-88
Physics
1
Sunspots, Umbra
Scientific paper
The statistical properties of area and brightness of umbral dots, formed in a sunspot umbra observed on 18 June 2004, are studied using an improved method of image segmentation and feature tracking algorithm. Central (peripheral) umbral dots have a typical size around 0.16 (0.17) arcsec. The brightness distribution of umbral dots shows a multi-population distribution. The brightness of the central umbral dots does not exceed 0.6 I quiet. In most cases, the area of central (peripheral) umbral dots reaches its maximum 40 s (150 s) after their brightness maximum, respectively. The brightness of umbral dots does not show any directly proportional behavior with their lifetimes and areas. The temporal variations of some physical parameters of umbral dots are studied. It seems that these variations are not physical processes in an umbra and are correlated to the images quality (seeing variations). The lifetime distribution of umbral dots is an exponential function and central (peripheral) umbral dots have a typical half-life of about 300 s (180 s), respectively.
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