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Solar 3He-rich events and abnormal enhancements of heavy-ion isotopes accelerated in two stages
Physics Department, Alabama A. & M. University, Normal, Alabama, USA
National Astronomical Observatories, Chinese Academy of Sciences, Beijing, China
Physics Department, Alabama A. & M. University, Normal, Alabama, USA
Heating and acceleration of neon (20Ne), magnesium (24Mg), and their rare isotopes (22Ne and 26Mg) in solar 3He-rich events are investigated according to the two-stage acceleration mechanism. It is shown that 20Ne+8, 22Ne+9, 24Mg+10, and 26Mg+11 can be preferentially heated by H-cyclotron waves with a frequency close to twice the 3He-cyclotron frequency that also heat 3He, through the third harmonic cyclotron resonance. If the initial electron temperature is in the range of ∼2–10 MK, the abundance ratios 22Ne/20Ne and 26Mg/24Mg in high-energy particles due to the second-stage acceleration can be enhanced by a factor of ∼2–6 relative to the solar corona, which are consistent with the measurements of the University of Maryland particle instrument on the Solar Anomalous and Magnetospheric Particle Explorer and the Ultra Lower Energy Isotope Spectrometer particle instrument on the Advanced Composition Explorer.
Received 14 August 2005; accepted 25 October 2005; published 24 December 2005.
Citation: (2005), Solar 3He-rich events and abnormal enhancements of heavy-ion isotopes accelerated in two stages, J. Geophys. Res., 110, A12111, doi:10.1029/2005JA011360.
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