Dependence of the total area bright umbral dots of a sunspot on their brightness

Details Dependence of the total area bright umbral dots of a sunspot on their brightness Dependence of the total area bright umbral dots of a sunspot on their brightness

Feb 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997kfnt...13a..60a&link_type=abstract

Kinematika i Fizika Nebesnykh Tel, vol. 13, p. 60

Physics

Sunspots, Brightness Distribution, Umbras, Fine Structure, Emission Spectra, Solar Spectra, Magnetic Flux

Scientific paper

The true value of the area occupied by all bright umbral dots of a sunspot, which is difficult to measure directly, was estimated from the known values of their relative brightness (0.5-1.1) and mean brightness of umbra (0.06) in the spectral region 500 nm. We find that all bright umbral dots occupy, on the average, about 4 percent (from less than 3 to about 6 percent) of the total area of the umbra of a sunspot.

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