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磁暴恢复相后期超低频波观测分析

魏超 戴磊

魏超, 戴磊. 磁暴恢复相后期超低频波观测分析[J]. 空间科学学报, 2020, 40(4): 479-492. doi: 10.11728/cjss2020.04.479
引用本文: 魏超, 戴磊. 磁暴恢复相后期超低频波观测分析[J]. 空间科学学报, 2020, 40(4): 479-492. doi: 10.11728/cjss2020.04.479
WEI Chao, DAI Lei. Observations of ULF Waves at the Late Recovery Phase of Magnetic Storm[J]. Journal of Space Science, 2020, 40(4): 479-492. doi: 10.11728/cjss2020.04.479
Citation: WEI Chao, DAI Lei. Observations of ULF Waves at the Late Recovery Phase of Magnetic Storm[J]. Journal of Space Science, 2020, 40(4): 479-492. doi: 10.11728/cjss2020.04.479

磁暴恢复相后期超低频波观测分析

doi: 10.11728/cjss2020.04.479
基金项目: 

国家自然科学基金项目(41874175,41574161,41731070,41574159)和中国科学院空间科学先导专项(二期)项目(XDA15052500,XDA15350201)共同资助

详细信息
    作者简介:

    魏超,E-mail:weichaojl@126.com

  • 中图分类号: P353

Observations of ULF Waves at the Late Recovery Phase of Magnetic Storm

  • 摘要: 利用Radiation Belt Storm Probes(RBSP)和Magnetospheric Multiscale(MMS)的联合观测研究了2016年1月25日和2月22日的两个超低频(ULF)波动事件.这两个事件均发生在磁暴的恢复相后期,波动分布在晨侧与正午之间的区域.RBSP观测到的两次波动都发生在低L-shell(4.7~5.8),MMS观测到的两次波动都发生在高L-shell(8.0~14.2).在高L-shell,超低频波偏振以环向波为主,沿磁力线方向为基频谐波.在低L-shell,超低频波偏振以径向波为主,沿磁力线方向为二次谐波.对内磁层(L<6)中的ULF波,通过比较∂f/∂w|μ,L和(dL)/(dW)(∂f)/(∂L)|μ,W的绝对值可知,bump-on-tail的离子分布和向地的离子相空间密度梯度通过N=1的弹跳共振,共同为波动的产生提供自由能.多重事例分析表明,在磁暴恢复相后期,约10keV的离子伴随着波动的存在而存在,并且为波动的产生提供自由能.

     

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出版历程
  • 收稿日期:  2019-04-09
  • 修回日期:  2019-10-15
  • 刊出日期:  2020-07-15

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