Physics
Scientific paper
Dec 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000kfnt...16..541a&link_type=abstract
Kinematika i Fizika Nebesnykh Tel, vol. 16, no. 6, p. 541-551
Physics
1
Scientific paper
The investigation of the velocities field at the chromospheric and photospheric levels in the course of flare development may be an experimental test of the existing theoretical flare models. To study the velocity field in a flare, we used the chromospheric Hα line and some Fraunhofer lines formed at different levels in the photosphere. The spectra were obtained at Terskol Peak. The observations allowed us determine the velocities in different parts of the Hα flare loop. 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 the chromosphere at the footpoints of a flaring loop. The velocities drop from 23 km/s in the chromosphere to 0.7 km/s in the middle photosphere. The maximum velocities refer to the outer edge of the footpoints of the flaring loop.
Alikaeva K. V.
Chornogor S. N.
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