【摘 要】
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The Voyager 1 & 2 spacecraft crossed the termination shock (TS) in 2004 and 2007 respectively,which was a great milestone for mankind on jouey to interstellar s
【机 构】
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SIGMA Weather Group, State Key Laboratory of Space Weather, Center for Space Science and Applied Res
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The Voyager 1 & 2 spacecraft crossed the termination shock (TS) in 2004 and 2007 respectively,which was a great milestone for mankind on jouey to interstellar space.In the vicinity of TS,Voyagers observations of energetic particles with energy below ～20 MeV,[1] which are usually named termination shock particles (TSPs),show a number of interesting and unexpected features.First,in the upstream of the TS,the ions pitch-angle anisotropies are very large,but in the downstream in the heliosheath,it converges to a steady-state isotropic distribution.[2,3]Second,there appears to be a large highly anisotropic intensity spike.[3] Third,the energetic ion spectrum tends to have multiple power-laws[4] contrasted with the expected single power law that is often observed associated with the energetic particles in the heliosphere.Some of these features of TSPs still await satisfactory explanations.
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