Preliminary observation of missing energy flux of sunspot

Details Preliminary observation of missing energy flux of sunspot Preliminary observation of missing energy flux of sunspot

Sep 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981soph...73...37h&link_type=abstract

Solar Physics, vol. 73, Sept. 1981, p. 37-43.

Physics

6

Astronomical Photography, Energy Dissipation, Solar Radiation, Sunspots, Brightness, Penumbras, Photosphere

Scientific paper

A search has been conducted for the missing energy flux of sunspots by measuring white-light photographs over the region around the sunspots exceeding ten times the diameter of the spots. It was found that the excess brightness amounts to 0.3-0.8% of the local continuum intensity immediately beyond the penumbra and smoothly decreases to zero at the edge of the inspected radii of 130,000-160,000 km. This result suggests that the flux deficit in sunspots of the order of 30% over the umbra-penumbra is roughly the same as the excess flux found in the very large surrounding region which includes photospheric facular contributions. Among nineteen spots, fourteen showed this extended bright ring. Narrow band photoelectric scans revealed that the excess radiation originates in the continuum, not from weakened absorption lines.

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