Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...422l..25h&link_type=abstract
Astrophysical Journal, Part 2 - Letters (ISSN 7004-637X), vol. 422, no. 1, p. L25-L27
Astronomy and Astrophysics
Astrophysics
70
Chromosphere, Cosmic X Rays, Gamma Rays, Satellite Observation, Solar Flares, Sun, X Ray Spectra, Cosmic Plasma, Thermal Radiation, X Ray Binaries, X Ray Telescopes
Scientific paper
The Yohkoh soft X-ray telescope has observed impulsive, thermal, soft X-ray emission at the footpoints of magnetic loops during solar flares. The soft X-ray (thermal) time profiles at the footpoints closely match the hard X-ray (nonthermal) time profiles, directly demonstrating the heating of the lower solar atmosphere on short timescales during the interval of nonthermal energy release. This phenomenon is the rule, rather than the exception, occurring in the majority of flares that we have examined with the Yohkoh data. We illustrate the impulsive behavior with data from the major flare of 1992 January 26. For this flare, the soft X-ray peak times matched the hard X-ray peak times within the time resolution of the soft X-ray measurements (about 10 s), and the soft and hard X-ray locations match within the resolution of the hard X-ray imager. The impulsive soft X-ray emission clearly has a thermal spectral signature, but not at the high temperature of a 'superhot' source. We conclude that the impulsive soft X-ray emission comes from material heated by precipitating electrons at loop footpoints and evaporating from the deeper atmosphere into the flaring flux tube.
Dennis Brian R.
Hudson Hugh S.
Inda Mika
Kosugi Taichi
Sakao Taro
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