Acceleration and Enrichment of 3He in Impulsive Solar Flares by Electron Firehose Waves

Details Acceleration and Enrichment of 3He in Impulsive Solar Flares by Electron Firehose Waves Acceleration and Enrichment of 3He in Impulsive Solar Flares by Electron Firehose Waves

May 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agusmsh32b..02p&link_type=abstract

American Geophysical Union, Spring Meeting 2002, abstract #SH32B-02

Other

7509 Corona, 7514 Energetic Particles (2114), 7519 Flares, 7807 Charged Particle Motion And Acceleration, 7867 Wave/Particle Interactions

Scientific paper

A new mechanism for acceleration and enrichment of 3He during impulsive solar flares is presented. Low-frequency electromagnetic plasma waves excited by the Electron Firehose Instability (EFI) account for the acceleration of ions up to 1; {MeV;amu}-1 energies as a single stage process. The EFI arises as a direct consequence of the free energy stored in a temperature anisotropy (Te_∥/Te_perpendicular to >1) of the bulk energized electron population during the acceleration process. In contrast to other mechanisms which require special plasma properties, the EFI is an intrinsic feature of the acceleration process of the bulk electrons. Being present as a side effect in the flaring plasma, these waves can account for the acceleration of 3He and 4He while selectively enhancing 3He due to the spectral energy density obtained from linear growth. Linearized kinetic theory, analytic models and test-particle simulations have been applied to investigate the ability of the waves to accelerate and fractionate. Plausible models have been found that can explain the observed energies, spectra and abundances of 3He and 4He.

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