An Explanation for Huge Enhancements of Ultraheavy Ions in Solar 3He-rich Events

Details An Explanation for Huge Enhancements of Ultraheavy Ions in Solar 3He-rich Events An Explanation for Huge Enhancements of Ultraheavy Ions in Solar 3He-rich Events

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004apj...617l..77z&link_type=abstract

The Astrophysical Journal, Volume 617, Issue 1, pp. L77-L80.

Astronomy and Astrophysics

Astronomy

4

Acceleration Of Particles, Ism: Cosmic Rays, Sun: Solar Wind, Sun: Abundances, Sun: Flares, Sun: Particle Emission

Scientific paper

Preferential heating and selective acceleration of oxygen (O) and ultraheavy ions (UH) with an atomic number Z>34 in solar 3He-rich or impulsive flares are theoretically and numerically investigated according to the two-stage acceleration mechanism. It is shown that parallel propagating ion-cyclotron Alfvén waves can be much more efficient at heating ultraheavy ions than at heating oxygen through cyclotron resonances. This preferential heating of ultraheavy ions can result in three-order enhancements of abundance ratio UH/O in high-energy nuclei accelerated in the solar impulsive flares, which are consistent with the extreme enhancements of ultraheavy ions relative to oxygen observed in solar 3He-rich events in recent years.

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