【摘 要】
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A scenario for the temperature anisotropy of heavy ions and the different streamingspeed between heavy ions and protons observed in solar wind is presented.It is demonstrated thathelium ions can be pi
【机 构】
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School of Earth and Space Science, University of Science and Technology of China, Hefei, 230026
【出 处】
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第十届海峡两岸空间/太空科学研讨会
论文部分内容阅读
A scenario for the temperature anisotropy of heavy ions and the different streamingspeed between heavy ions and protons observed in solar wind is presented.It is demonstrated thathelium ions can be picked up by turbulent Alfven waves based on the observed wave energydensity by Helios at 0.7 AU.The physical processes for the pick-up are discussed in detail.Boththe high frequency Alfven-cyclotron waves and low frequency Alfven waves play key roles duringthe pick-up process.The kinetic characters of alpha particle from simulation results are generallyconsistent with their in situ observation properties in solar wind,such as the double streamingpeaks and asymmetry of velocity distribution along the ambient magnetic field,and the variationof the temperature anisotropy with the different stream speed between alpha particles and protons.
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