Abstract

We have analyzed the solar flare of 1538 UT, 17 Feb. 1992 in terms of a model in which electric fields produce both thermal emission from Joule heated electrons and nonthermal emission from runaway electrons (Holman 1985, Benka & Holman 1994). The flare was observed by the Compton Gamma Ray Observatory Burst and Transient Source Experiment (BATSE), the Yohkoh satellite, and GOES. The Yohkoh images show a single soft X-ray loop with hard X-ray sources at the loop footpoints and at the looptop. We assume in our model that the electric fields are parallel to the length of the loop, the hard X-ray footpoint emission is nonthermal thick-target emission, and the looptop emission is thermal emission due to Joule heating. The measured BATSE hard X-ray spectra were fit with functions derived from the electric field model. The work is described in greater detail in Kucera et al. 1995.

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