Compression-related EMIC waves drive relativistic electron precipitation
Compression-related EMIC waves drive relativistic electron precipitation
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DOI：
10.1007/s11431-014-5701-3
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发表时间：
2014-11
期刊：
影响因子：
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通讯作者：
Dedong Wang;Z. Yuan;X. Deng;Meng Zhou;Shiyong Huang;Ming Li;Huimin Li;Haimeng Li;T. Raita
中科院分区：
文献类型：
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作者：
Dedong Wang;Z. Yuan;X. Deng;Meng Zhou;Shiyong Huang;Ming Li;Huimin Li;Haimeng Li;T. Raita
利用NOAA 15号卫星和芬兰OUL磁力计站的协同观测，我们报道了2007年1月1日在地静止过程中，由磁层压缩激发的电磁离子回旋波驱动相对论性电子沉淀。在太阳风动压（SWDP）增强后，OUL站观测到日侧的Pc1脉动。这种Pc1脉动是由从产生源传播到较低高度的主位波引起的。同时，NOAA 15号卫星在质子各向异性区域内记录到能量为3兆电子伏特的沉淀电子计数率的增强。这一现象与本文提出的拟线性理论计算是一致的。我们的观测结果表明，在太阳风的正脉冲作用下，压缩相关的位波可以驱动相对论性电子沉淀，在辐射带动力学中起着关键作用。
With coordinated observations of the NOAA 15 satellite and OUL magnetometer station in Finland, we report that the electromagnetic ion cyclotron (EMIC) waves which were stimulated by the compression of the magnetosphere drive relativistic electron precipitation in geoquiescence on 1 Jan 2007. After an enhancement of solar wind dynamic pressure (SWDP), a dayside Pc1 pulsation was observed by the OUL station. Such a Pc1 pulsation is caused by an EMIC wave which propagates from the generation source to lower altitudes. Simultaneously, the NOAA 15 satellite registered an enhancement of precipitating electron count rates with energies >3 MeV within the anisotropic zone of protons. This phenomenon is coincident with the quasi-linear theoretical calculation presented in this paper. Our observations suggest that after a positive impulse of solar wind, the compression-related EMIC waves can drive relativistic electrons precipitation and play a pivotal role in the dynamic of radiation belts.