Solar Impulsive Hard X-Ray Emission and Two-Stage Electron Acceleration

Details Solar Impulsive Hard X-Ray Emission and Two-Stage Electron Acceleration Solar Impulsive Hard X-Ray Emission and Two-Stage Electron Acceleration

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006chjaa...6..733z&link_type=abstract

Chinese Journal of Astronomy & Astrophysics, Vol. 6, p. 733-740

Astronomy and Astrophysics

Astrophysics

Acceleration Of Particles, Instabilities, Plasmas, Sun: Flares, Sun: Particle Emission, Sun: X-Ray

Scientific paper

Heating and acceleration of electrons in solar impulsive hard X-ray (HXR) flares are studied according to the two-stage acceleration model developed by Zhang for solar ^3He-rich events. It is shown that electrostatic H-cyclotron waves can be excited at a parallel phase velocity less than about the electron thermal velocity and thus can significantly heat the electrons (up to 40~MK) through Landau resonance. The preheated electrons with velocities above a threshold are further accelerated to high energies in the flare-acceleration process. The flare-produced electron spectrum is obtained and shown to be thermal at low energies and power law at high energies. In the non-thermal energy range, the spectrum can be double power law in the spectral power index is energy dependent or related. The electron energy spectrum obtained by this study agrees quantitatively with the result derived from the Reuven Ramaty High Energy Solar Spectroscopic Imager (RHESSI) HXR observations in the flare of 2002 July 23. The total flux and energy flux of electrons accelerated in the solar flare also agree with the measurements.

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