Evidence for a shock front in a flare loop of June 20, 1989

Details Evidence for a shock front in a flare loop of June 20, 1989 Evidence for a shock front in a flare loop of June 20, 1989

Apr 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26as...98..261g&link_type=abstract

Astronomy and Astrophysics Supplement Series (ISSN 0365-0138), vol. 98, no. 2, p. 261-268.

Astronomy and Astrophysics

Astrophysics

4

Coronal Loops, Shock Fronts, Solar Flares, H Alpha Line, Line Spectra, Microwave Frequencies, Radio Telescopes, Solar X-Rays, Thermal Conductivity

Scientific paper

We have observed in all H-alpha flare kernel several intensity peaks during the post impulsive phase of a 3B/X1.6 limb flare with high temporal resolution. With an imaging spectrograph line profiles have been acquired every 2.3 s. We have correlated the temporal evolution in different spectral channels of H-alpha with hard X-ray data from HXRBS and with microwave data from our radiotelescopes. We find different time lags of order of seconds which are explained by a shock front moving towards the chromosphere at either alfvenic speed or thermal conduction front speed. Finally, locally depending spectroscopic features are found within the H-alpha kernel during the enhanced emission.

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