Lower photosphere of the active regions of the sun prior to flares and in the absence of flares. II - Physical conditions

Details Lower photosphere of the active regions of the sun prior to flares and in the absence of flares. II - Physical conditions Lower photosphere of the active regions of the sun prior to flares and in the absence of flares. II - Physical conditions

Apr 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993kfnt....9...57a&link_type=abstract

Kinematika i Fizika Nebesnykh Tel (ISSN 0233-7665), vol. 9, no. 2, p. 57-70.

Physics

Atmospheric Composition, Photosphere, Plasma Turbulence, Solar Atmosphere, Solar Flares, Fraunhofer Lines, Gas Pressure, Gas Temperature, Solar Activity

Scientific paper

Physical conditions are analyzed in the lower and middle photospheric layers of the active regions prior to and in the absence of flares. The temperature, gas pressure, and turbulent velocities are determined from intercomparisons of observed and theoretical profiles of several Fraunhofer lines insensitive to magnetic fields. In deep layers, the characteristics obtained for regions without flares agree quite well with the VAL-F model of a facula. In the lower photosphere (m equal to or greater than 2), the difference between physical conditions in regions with and without flares becomes apparent as early as 10 h prior to flares. Immediately before a flare, sharp changes in all medium characteristics are observed; the temperature excess may reach 300 K, with a 25-percent excess in density. As the height increases, in middle photosphere, the differences diminish.

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