Isotopic anomalies among solar energetic particles Contribution of preacceleration in collapsing magnetic neutral sheets

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Cosmic Rays, Particle Acceleration, Solar Flares, Solar Magnetic Field, Abundance, Energetic Particles, Galactic Radiation, Isotopes, Magnetohydrodynamics, Neutral Sheets, Solar Cosmic Rays

Scientific paper

Anomalous abundances of elements among solar flare particles have previously been interpreted in terms of a contribution from pre-acceleration in collapsing magnetic neutral sheets. Here, we examine the isotopic anomalies which are predicted by this pre-acceleration mechanism. We find enhancements of neutron-rich isotopes, but the enhancements are not a monotonic function of the mass ratio. Thus, enhancement of 22Ne/20Ne need not be accompanied by any significant enhancements in, say, 18O/16O or 26Mg/24Mg. High temperatures (such as those in flares) favor enhancement of 22Ne/20Ne as the dominant isotopic anomaly. These results may help to account for some of the observed isotopic anomalies among solar energetic particles.

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