Evidence for Both Electron Acceleration and Direct Heating in Solar Flares

Details Evidence for Both Electron Acceleration and Direct Heating in Solar Flares Evidence for Both Electron Acceleration and Direct Heating in Solar Flares

Jul 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994kofu.symp..217d&link_type=abstract

In: Proceedings of Kofu Symposium, Kofu, Japan, Sept. 6-10, 1993, p.217-220.

Computer Science

4

Scientific paper

It is well known that in many impulsive solar flares, the time profile of the total soft X-ray flux closely matches the time integral of the hard X-ray profile, the so-called Neupert Effect. We have selected several flares detected by the X-ray telescopes on Yohkoh that clearly show this effect and examined the time profiles for different spatial locations throughout the flaring region. We find that footpoint locations show coincident impulsive bursts in both soft and hard X-ray emissions whereas loop-top locations show more gradually varying soft X-ray emission with weaker hard X-ray emission. We interpret these observations in terms of an electric field model in which both Joule heating and electron runaway acceleration take place, with the ratio of the two dependent on how strong the field is compared to the local Dreicer field. The pre-impulsive phase emissions and the early gradually-varying soft X-ray emission can be attributed to the direct heating by the electri! c field in the coronal part of the loop and the impulsive footpoint emission can be attributed to both enhanced Joule heating and electron precipitation.

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