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通量传输事件相关的动力学磁场湍流观测研究

周招弟 张辉 倪彬彬 张晓佳 朱昌波 付松

周招弟, 张辉, 倪彬彬, 张晓佳, 朱昌波, 付松. 通量传输事件相关的动力学磁场湍流观测研究[J]. 空间科学学报, 2018, 38(2): 169-177. doi: 10.11728/cjss2018.02.169
引用本文: 周招弟, 张辉, 倪彬彬, 张晓佳, 朱昌波, 付松. 通量传输事件相关的动力学磁场湍流观测研究[J]. 空间科学学报, 2018, 38(2): 169-177. doi: 10.11728/cjss2018.02.169
ZHOU Zhaodi, ZHANG Hui, NI Binbin, ZHANG Xiaojia, ZHU Changbo, FU Song. Kinetic Magnetic Turbulence Associated with Flux Transfer Events Observed by THEMIS Satellite ormalsize[J]. Journal of Space Science, 2018, 38(2): 169-177. doi: 10.11728/cjss2018.02.169
Citation: ZHOU Zhaodi, ZHANG Hui, NI Binbin, ZHANG Xiaojia, ZHU Changbo, FU Song. Kinetic Magnetic Turbulence Associated with Flux Transfer Events Observed by THEMIS Satellite ormalsize[J]. Journal of Space Science, 2018, 38(2): 169-177. doi: 10.11728/cjss2018.02.169

通量传输事件相关的动力学磁场湍流观测研究

doi: 10.11728/cjss2018.02.169
基金项目: 

国家自然科学基金项目(41274171)和中国科学院科技创新交叉与合作团队项目(KZZD-EW-01-3)共同资助

详细信息
    作者简介:

    周招弟,E-mail:zhouzhaodi@mail.iggcas.ac.cn

  • 中图分类号: P353

Kinetic Magnetic Turbulence Associated with Flux Transfer Events Observed by THEMIS Satellite ormalsize

  • 摘要: THEMIS卫星观测到通量传输事件(FTE)的同时,也在磁层侧涡流区域观测到强磁场扰动现象.利用快速傅里叶变换分析磁场扰动频谱特征发现:大约在FTE的扰动频率(约0.1Hz)处,功率谱密度达到峰值;在质子回旋频率(约1Hz)至64Hz的频段内,功率谱密度随着频率的增大而减小,服从幂律分布P0 f-α.因此,可以认为这些磁场扰动为低纬边界层中的动力学磁场湍流.研究结果表明,当低纬边界层(Low Latitude Boundary Layer,LLBL)中卫星相对磁层顶或FTE的位置越来越远时,功率谱密度与功率谱斜率α(幂律指数)降低,但FTE所在的方位角或低纬磁层顶的磁地方时对幂律指数α和功率谱密度没有显著影响.这些观测特征表明移动的FTE是磁场湍流的源.磁层顶上的大规模扰动(如FTE)和相关的磁场湍流从动力学尺度揭示了磁鞘与磁层的类黏滞相互作用.然而低纬边界层中FTE磁层侧涡流形成所需的黏滞性是否可由磁场湍流来提供还需要验证.

     

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出版历程
  • 收稿日期:  2017-04-11
  • 修回日期:  2017-10-24
  • 刊出日期:  2018-03-15

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