On the formation of the helium-3 spectrum in impulsive solar flares

Details On the formation of the helium-3 spectrum in impulsive solar flares On the formation of the helium-3 spectrum in impulsive solar flares

Jun 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996aipc..374..498l&link_type=abstract

High energy solar physics. AIP Conference Proceedings, Volume 374, pp. 498-504 (1996).

Physics

3

Scientific paper

The resonant interaction with oblique electromagnetic ion-cyclotron waves is the most promising mechanism for selective acceleration of 3He ions in some impulsive solar flares. At the same time, the properties of the observed particle spectrum remain unexplained, in particular the spectral steepening or break at energies <10 MeV that leads to an increase in the effective power-law spectral index at higher energies. An analytical solution of the Fokker-Planck equation, describing the resonant wave-particle interaction, shows that the steepening is unlikely to stem from the action of the acceleration mechanism alone. It is argued that the Coulomb energy losses at energies greater than a few MeV may be large enough to provide the observed spectral break. Its position is determined by the balance between energy gain by acceleration and energy loss. Therefore, the position of the break may serve as a diagnostic tool for the study of the acceleration mechanism.

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