Other
Scientific paper
Aug 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006iaujd...3e..23a&link_type=abstract
Solar Active Regions and 3D Magnetic Structure, 26th meeting of the IAU, Joint Discussion 3, 16-17 August, 2006, Prague, Czech R
Other
Scientific paper
We study the two-ribbon solar flare on 7 October 1979. As may be seen from the GOES soft X-ray data, the preheating phase preceded the flare impulsive phase. The semiempirical photospheric models for different stages of flare development are calculated on the basis of observed Fraunhofer spectra. The temporal variations of the magnetic field strength and the inclination of the magnetic field vector are obtained as well. The modelling results reveal inhomogeneities of temperature, gas pressure, and other parameters. Disturbances of the matter below undisturbed photosphere base prevailed during the preheating phase. Narrow and cool layers were displaced upwards in the 0.5 min time interval. During the impulsive phase and at the flare maximum the upper and middle photospheric layers were mainly disturbed. For this period the downward displacement of the lower boundary of wide low-temperature region in the upper photosphere took place. The photosphere perturbations were still preserved at 25-30 minutes after the flare maximum. The turbulent motions were inhibited during the flare.
Alikaeva K. V.
Kondrashova N. N.
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