Stochastic Ion Acceleration in 3He-Rich Solar Energetic Particle Events

Details Stochastic Ion Acceleration in 3He-Rich Solar Energetic Particle Events Stochastic Ion Acceleration in 3He-Rich Solar Energetic Particle Events

May 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agusmsp21a..08l&link_type=abstract

American Geophysical Union, Spring Meeting 2005, abstract #SP21A-08

Physics

2118 Energetic Particles, Solar, 2159 Plasma Waves And Turbulence, 2451 Particle Acceleration, 2483 Wave/Particle Interactions, 7519 Flares

Scientific paper

The enhancements of heavy ions in impulsive solar energetic particle (SEP) events have long been seen as evidence for stochastic acceleration (SA) of particles by plasma wave turbulence. However, the lack of quantitative comparison of model predictions with observations prevents a solid conclusion about the underlying physical processes. By using the exact dispersion relation and taking into account the effects of background α-particles, we show that SA by parallel propagating waves can address the long standing challenge to SA models, namely the prominent enhancement and distinct spectrum of 3He ions in some impulsive solar flares. Encouraged by this and in light of recent detections of ultra-heavy ions in SEPs by ACE and WIND, we investigate the SA of all ions by parallel propagating waves. The observed ion spectra and enhancements are used to constrain the turbulence spectrum and energy partition among different wave branches. Based on this scenario, we explore the model parameter space to explain the recently discovered correlation between ion enhancements and the iron spectral index and the correlated enhancements of heavy ions. The limitations of the model are described and possible solutions to these difficulties are discussed. The work at Stanford is supported by NSF grant ATM-0312344, NASA grants NAG5-12111, NAG5 11918-1, and NASA grant PC 251429 through University of Maryland (PI: G. M. Mason).

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