| GEOPHYSICS, ASTRONOMY, AND ASTROPHYSICS |
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North west cape-induced electron precipitation and theoretical simulation |
| Zhen-xia Zhang(张振霞)1, Xin-qiao Li(李新乔)2, Chen-Yu Wang(王辰宇)3, Lun-Jin Chen4 |
1 National Earthquake Infrastructure Service, China Earthquake Administration, Beijing 100045, China;
2 Institute of High Energy Physics, Chinese Academic Sciences, Beijing 100049, China;
3 Peking University, Beijing 100871, China;
4 Department of Physics, University of Texas at Dallas, Richardson, Texas, USA |
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Abstract Enhancement of the electron fluxes in the inner radiation belt, which is induced by the powerful North West Cape (NWC) very-low-frequency (VLF) transmitter, have been observed and analyzed by several research groups. However, all of the previous publications have focused on NWC-induced >100-keV electrons only, based on observations from the Detection of Electro-Magnetic Emissions Transmitted from Earthquake Regions (DEMETER) and the Geostationary Operational Environmental Satellite (GOES) satellites. Here, we present flux enhancements with 30-100-keV electrons related to NWC transmitter for the first time, which were observed by the GOES satellite at night. Similar to the 100-300-keV precipitated-electron behavior, the low energy 30-100-keV electron precipitation is primarily located east of the transmitter. However, the latter does not drift eastward to the same extent as the former, possibly because of the lower electron velocity. The 30-100-keV electrons are distributed in the L=1.8-2.1 L-shell range, in contrast to the 100-300-keV electrons which are at L=1.67-1.9. This is consistent with the perspective that the energy of the VLF-wave-induced electron flux enhancement decreases with higher L-shell values. We expand upon the rationality of the simultaneous enhancement of the 30-100- and 100-300-keV electron fluxes through comparison with the cyclotron resonance theory for the quasi-linear wave-particle interaction. In addition, we interpret the asymmetry characteristics of NWC electric power distribution in north and south hemisphere by ray tracing model. Finally, we present considerable discussion and show that good agreement exists between the observation of satellites and theory.
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Received: 16 April 2016
Revised: 27 July 2016
Accepted manuscript online:
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PACS:
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94.20.wj
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(Wave/particle interactions)
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94.30.Tz
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(Electromagnetic wave propagation)
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93.85.Rt
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(Seismic methods)
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| Fund: Supported by the China Seismo-Electromagnetic Satellite Mission Ground-Based Verification Project of the Administration of Science, Technology, and Industry for National Defense and Asia-Pacific Space Cooperation Organization Project (APSCO-SP/PM-EARTHQUAKE). |
Corresponding Authors:
Zhen-xia Zhang
E-mail: zxzhang@neis.cn
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Cite this article:
Zhen-xia Zhang(张振霞), Xin-qiao Li(李新乔), Chen-Yu Wang(王辰宇), Lun-Jin Chen North west cape-induced electron precipitation and theoretical simulation 2016 Chin. Phys. B 25 119401
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