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《Acta Astronomica Sinica》 2002-01
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The Study of the Acceleration Mechanism of the ~3He and Heavier Ions by Alfven Tuebulence in the Impulsive Flares

WU Gui-Ping, WANG DE-Yu, XU Ao-Ao, TANG Yu-Ha (Department of Physics,Southeast University, Nanjing 210096) (Purple Mountain Observatory,Sinica of China, Nanjing 210008) (Department of Astronomy,Nanjing University, Nanjing 210093)  
According to the observational similar spectra forms of the energetic 3He and heavier ions in the 3He-rich events, we have solved Fokker-Planck equation numerically to study the evolutional properties of 3He and heavier ions accelerated by Alfven turbulence with time. It's shown that the distribution of the energetic particles is mainly decided by the plasma density and the energy density of Alfven turbulence .If the plasma density, the magnetic field intensity and the energy density of Alfven turbulence are respectively taken (0.1 - 1)1010cm-3 ,50 - 100Gs and 0.4- 2ergscm-3 in the accelerative region, the energy of the accelerated 311e and heavier ions is t.he order of 10MeV/nucleon and the spectrum index is about 2 - 3.5 after is. All of these are basically consistent with the observations.
【Fund】: 国家自然科学基金(NSFC)项目(编号 10073500)
【CateGory Index】: P182
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