Heavy ion acceleration by cascading Alfvén waves in impulsive solar flares

Details Heavy ion acceleration by cascading Alfvén waves in impulsive solar flares Heavy ion acceleration by cascading Alfvén waves in impulsive solar flares

Jun 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996aipc..374..450m&link_type=abstract

High energy solar physics. AIP Conference Proceedings, Volume 374, pp. 450-460 (1996).

Physics

17

Plasma Turbulence

Scientific paper

We propose that the heavy ion abundance enhancements that are observed for impulsive solar flares result from stochastic acceleration by cascading Alfvén wave turbulence. In our model, Alfvén waves are generated at some large scale and nonlinearly cascade to higher wavenumbers and frequencies. As the waves increase in frequency, they will be able to cyclotron resonate with ions of progressively lower energy. For a thermal plasma there will be no damping at low wavenumbers and the waves will freely cascade. However, when the wave frequency becomes close to an ion cyclotron frequency, thermal ions will be accelerated out of the background and to relativistic energies. The first ion species encountered by the waves will be the one with the lowest cyclotron frequency, namely Fe. Due to the low Fe abundance, the waves will not be completely damped and will continue to cascade up to the group of ions with the next higher cyclotron frequency, namely Ne, Mg, and Si. Again, these ions will be accelerated but the waves will not be totally damped. After Ne, Mg, and Si the waves encounter 4He, C, N, and O, which do completely dissipate the waves and halt the cascade. We show that abundance ratios similar to those observed can result from this process.

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