State of plasma and motions in chromospheric and photospheric parts of the flare Hα loop

Details State of plasma and motions in chromospheric and photospheric parts of the flare Hα loop State of plasma and motions in chromospheric and photospheric parts of the flare Hα loop

Sep 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000kfnts...3..441a&link_type=abstract

Kinematika i Fizika Nebesnykh Tel, Suppl, no. 3, p. 441-444

Physics

Scientific paper

The velocity field and the matter state at the chromospheric and photospheric levels in the course of flare development were investigated. To study the physical parameters of the matter in the flare, we used the chromospheric Hα line and some Fraunhofer lines formed at different levels in the photosphere. The observations at the Peak Terskol allowed us to determine the velocities and physical conditions in different parts of the flare Hα loops. The blue shift of the Hα line was recorded only at the impulsive phase and only at the top of the loop. The velocities decrease during one minute and their sign changes at the Hα maximum. Positive line-of-sight velocities were found both in the photosphere and chromosphere at the footpoint of a flaring loop. The velocities drop from 23 km/s in the chromosphere to 0.7 km/s in the middle photosphere. Such motion type points to the flare Hα loop lifting during impulsive phase and downward motion of a matter along the loop branch. The simulation reveals a condensation arised in the temperature minimum region during impulsive phase at the base of the flare loop. This condensation moves downward. The temperature excess in the flare Hα maximum was about 1000 K and magnetic field strength was 250 G.

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