Precipitation in trap models for solar hard X-ray bursts

Astronomy and Astrophysics – Astronomy

Scientific paper

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Electron Precipitation, Magnetically Trapped Particles, Solar X-Rays, X Ray Spectra, Atmospheric Models, Energy Spectra, Particle Interactions, Wave Interaction

Scientific paper

Precipitation of electrons due to collisions necessarily occurs in trap models for hard X-ray bursts, and the thick-target emission from the precipitating electrons produces an X-ray spectrum similar in intensity and spectral shape to that from the trapped electrons. Such a trap-plus-precipitation model combines attractive features and removes some of the difficulties of thick-target and simple trap models. The evolution of the trap-plus-precipitation model is amenable to an analytical description, which is presented, including inversion, to find the injection electron spectrum from the X-ray spectrum. Streaming instabilities are unlikely to be important. Resonant scattering is also probably not important for the electrons which emit most of the X-rays, but may well be important for the higher-energy electrons which generate microwave bursts.

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