Energetic electrons in impulsive solar flares

Physics

Scientific paper

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High Energy Electrons, Prediction Analysis Techniques, Solar Flares, Solar Maximum Mission, X Rays, Electron Distribution, Emission Spectra, Mathematical Models, Observatories, Plasmas (Physics), Turbulence

Scientific paper

Impulsive bursts of hard X-rays and microwaves are observed during most solar flares, and both emissions are attributed to a common distribution of source electrons with energies from approximately 10 keV to several hundred keV. A detailed account of the evolution of the electron distribution is crucial to a complete description of the energy release process in flares. An analysis is made of a thermal flare model proposed by Brown, Melrose, and Spicer (1979) and Smith and Lilliequist (1979). They assumed the source of impulsive hard X-rays to be a plasma at a temperature of approximately 10 to the 8th power K, initially located at the apex of a coronal arch, and confined by ion-acoustic turbulence in a collisionless conduction front. The X-ray observations were obtained with the Hard X-ray Burst Spectrometer on board the Solar Maximum Mission spacecraft, and the microwave observations were obtained from the Bern Radio Observatory in Switzerland. The results are in good agreement with the model and are not explained by any other flare models which were considered.

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