Hα line profile observations of solar flares with high temporal resolution

Details Hα line profile observations of solar flares with high temporal resolution Hα line profile observations of solar flares with high temporal resolution

Mar 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988soph..114..115w&link_type=abstract

Solar Physics, Volume 114, Issue 1, pp.115-126

Physics

Scientific paper

Hα line profile observations of solar flares with high temporal resolution are an important tool for the analysis of the energy transport mechanism from the site of the flare energy release to the chromosphere. A specially designed instrument (imaging spectrograph) allows two-dimensional imaging of an active region simultaneously in 15 spectral channels along the Hα line profile with a temporal resolution of 5.4 s. Two flares have been observed in November 1982. The first one shows Hα signatures which one would typically expect in the case of explosive chromospheric evaporation produced by massive injection of non-thermal electrons. The observations of the other flare indicate that the heating of the upper chromosphere is dominated by thermal conduction, although during the impulsive hard X-ray burst there are also signatures of heating by non-thermal electrons.

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