Comparison Of Photospheric Physical Conditions Before And In The Onset Of A Solar Two-Ribbon Flare

Details Comparison Of Photospheric Physical Conditions Before And In The Onset Of A Solar Two-Ribbon Flare Comparison Of Photospheric Physical Conditions Before And In The Onset Of A Solar Two-Ribbon Flare

Aug 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006iaujd...3e..20c&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

Physics

Scientific paper

Modelling of the photospheric layers is carried out to study their physical state in two sites of an active region about 30 minutes before and in the onset phase of the solar two-ribbon 2N/M2 flare. The soft X-ray enhancement and microwave bursts occurred prior to and during the flare. The models derived from the inversion reproduce the spectral observations in several Fraunhofer lines. All the lines are weakened to a various degree before the flare relative to those in the quiet photosphere spectrum. In the initial phase of the flare they became still more weak and wide. The models consist of two atmospheres: the magnetic flux tube and the ambient medium. The inferred models show the changes in all photospheric parameters both before and in the onset of the flare. A comparative analysis reveals the difference between photospheric physical conditions in two kernels. Before the flare the inner kernel located near the filament was cooler than the outer one. The flux-tube models show strong downflows in the outer kernel and upflows in the inner kernel in the deep photospheric layers. Upward motions of the surrounding photospheric material were found. In the impulsive phase of the flare the variations of the photospheric parameters manifested itself in the inner kernel more than in outer one.

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