Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004apj...613l.165z&link_type=abstract
The Astrophysical Journal, Volume 613, Issue 2, pp. L165-L168.
Astronomy and Astrophysics
Astronomy
3
Acceleration Of Particles, Plasmas, Sun: Flares, Sun: Particle Emission, Sun: X-Rays, Gamma Rays
Scientific paper
A possible explanation is proposed for the double-power-law energy spectrum of electrons from solar 3He-rich events. According to the two-stage acceleration model that was developed by Zhang for the heating and acceleration of ions and electrons in solar 3He-rich events, the energy spectrum of electrons in the thermal to power law energy range is derived. It is shown that the electron flux generally includes a thermal component at low energies and a nonthermal component with a power-law spectrum at high energies. To have the double-power-law energy spectrum of electrons at the high energies, three empirical models are proposed in terms of the dependences of the spectral power index, the electron temperature, and the threshold energy on the electron energy. The numerical result obtained by this study for the energy spectrum of electrons at energies ~1-200 keV fits very well with the double-power-law spectrum measurement given by Reames, von Rosenvinge, & Lin.
Wang Jing-Xiu
Zhang Tian-Xi
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