Activation of a SPOT group and associated phenomena in the solar photosphere, chromosphere, and corona

Details Activation of a SPOT group and associated phenomena in the solar photosphere, chromosphere, and corona Activation of a SPOT group and associated phenomena in the solar photosphere, chromosphere, and corona

Jun 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997azh....74..466p&link_type=abstract

Astronomicheskij Zhurnal, vol. 74, p. 466

Astronomy and Astrophysics

Astronomy

2

Sunspots, Photosphere, Solar Corona, Chromosphere, High Temperature Plasmas, Plasma Heating, Solar Magnetic Field, Solar X-Rays

Scientific paper

An active region characterized by the development of a new bipolar spot group near a single spot remaining from a large group is studied. Observations at 2-4 cm on the RATAN-600 radio telescope, H-alpha spectroheliograms obtained on the tower solar telescope of the Kodaikanal Observatory in India, and observations on the panoramic magnetograph of the Sayan Observatory are used in the analysis. The activation of the active region was accompanied by significant brightening (by a factor of three) of the radio source associated with the old spot. In addition, a new filament formed, above which a halo-type radio source was produced. The activation process lasted 3-4 days. These features of the evolution of the active region are interpreted as the result of partial reconnection of magnetic force lines and the formation of a bipolar structure linking the old and new parts of the active region. Energy released during this reconnection provided additional plasma heating in the active region magnetosphere. Estimates of the effective brightness temperature Tb of the active region's radio emission show that it does not exceed the usual coronal values (1-3 MK). However, the spectrum of the emission suggests that there is a hot component in the corona above the active region, together with the thermal plasma.

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