Fokker-Planck Description of Electron Beams in the Solar Chromosphere

Details Fokker-Planck Description of Electron Beams in the Solar Chromosphere Fokker-Planck Description of Electron Beams in the Solar Chromosphere

Jul 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997apj...483..496m&link_type=abstract

Astrophysical Journal v.483, p.496

Astronomy and Astrophysics

Astronomy

7

Acceleration Of Particles, Sun: Chromosphere, Sun: X-Rays, Gamma Rays

Scientific paper

We numerically solve the relativistic Fokker-Planck equation for a beam of accelerated electrons impinging on the solar chromosphere, for several cases relevant to solar flares. We make a detailed comparison between our results and those obtained from the test-particle approach. We find that the inclusion of velocity diffusion changes significantly not only the resulting distribution function but also macroscopic quantities like the energy deposition rate and the hard X-ray emission. We find that the beam energy is deposited in a deeper and much broader region of the atmosphere. Also, our computations predict a harder and larger hard X-ray emission. These results might be relevant to the long-standing controversy between the thermal and the nonthermal models for the X-ray production, as well as to the study of the acceleration mechanisms of electron beams.

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