Time-dependent density in the electron-trap model of solar flare hard X-ray bursts

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Bursts, Electron Capture, Solar Electrons, Solar Flares, Solar X-Rays, Time Dependence, Electron Distribution, Particle Acceleration, Radiant Flux Density, Time Lag

Scientific paper

The behavior of the spatially homogeneous electron trap model of solar hard X-ray bursts is analyzed, allowing for possible temporal variation of ambient density. Significant departures from the constant density case are found. Delays in excess of those possible in the static trap model may occur, without appeal to additional acceleration. Also the time profile of the X-ray flux may reflect the fast electron source function, rather than the actual instantaneous electron population. Large delays between hard X-rays and microwaves are a likely consequence of this. The implications of the present results for inference of gradual phase acceleration processes are discussed as well as those of the site of the hard X-ray emission. It is emphasized that consideration of the possible effects of time-dependent density is necessary for reliable inference of the importance of any acceleration processes.

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