Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210008
National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012
Heavy Ions Acceleration in Impulsive Solar Flares
WANG De-Yu
Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210008
National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012
Abstract： The abundance enhancements of heavy ions Ne, Mg, Si and Fe in impulsive solar energetic particle (SEP) events are explained by a plasma acceleration mechanism. In consideration of the fact that the coronal plasma is mainly composed of hydrogen and helium ion, we think that the ion-ion hybrid wave and quasi-perpendicular wave can be excited by the energetic electron beam in impulsive solar flares. These waves may resonantly be absorbed by heavy ions when the frequencies of these waves are close to the second harmonic gyrofrequencies of these heavy ions. This requires the coronal plasma temperature to be located in the range of T ～ (5 - 9) x 106 K in impulsive solar flares and makes the average ionic charge state of these heavy ions in impulsive SEP events be higher than the average ionic charge state of these heavy ions in gradual SEP events. These preheated and enhanced heavy ions can successively and stochastically be accelerated by Alfvén turbulence and then form a power-law distribution in impulsive SEP events.
WANG De-Yu. Heavy Ions Acceleration in Impulsive Solar Flares[J]. 中国物理快报, 2002, 19(7): 1027-1030.
WANG De-Yu. Heavy Ions Acceleration in Impulsive Solar Flares. Chin. Phys. Lett., 2002, 19(7): 1027-1030.
2002, Vol. 19 
