Volume 44 Issue 6
Dec.  2024
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YANG Lixian, LIU Si, GAO Zhonglei, ZHOU Yaxiong, GAO Yang, WANG Bowen, JIN Yuyue. Statistical Study on Propagation Characteristics of Chorus in the Earth’s Magnetosphere (in Chinese). Chinese Journal of Space Science, 2024, 44(6): 998-1005 doi: 10.11728/cjss2024.06.2024-yg27
Citation: YANG Lixian, LIU Si, GAO Zhonglei, ZHOU Yaxiong, GAO Yang, WANG Bowen, JIN Yuyue. Statistical Study on Propagation Characteristics of Chorus in the Earth’s Magnetosphere (in Chinese). Chinese Journal of Space Science, 2024, 44(6): 998-1005 doi: 10.11728/cjss2024.06.2024-yg27
shu

Statistical Study on Propagation Characteristics of Chorus in the Earth’s Magnetosphere

doi: 10.11728/cjss2024.06.2024-yg27 cstr: 32142.14.cjss.2024-yg27

  • School of Physics and Electronic Sciences, Changsha University of Science and Technology, Changsha 410004

  • Received Date: 2024-10-05
  • Accepted Date: 2024-11-15
  • Rev Recd Date: 2024-11-07
    • Available Online: 2024-11-15
    Abstract
  • The frequency and normal angle of chorus waves are the key parameters affecting its interaction with electrons. Statistical analysis of Van Allen satellite data from 1 January 2013 to 31 December 2015, indicates that the strong chorus waves (>7×10–4 mV2·m–2·Hz–1) tend to appear in a narrower frequency range (0.3～0.4 fce) at normal angle θ around 35°. As L increases, the trend of narrowing chorus wave spectrum at θ≈35° becomes more pronounced. From the night to the dawn (21:00 MLT－09:00 MLT), chorus waves can be observed within a frequency range of 0.1～0.8 fce, but the spectral width of chorus waves at θ≈35° on the nightside is narrower than that on the dawn. From the morning to the dusk (09:00 MLT－21:00 MLT), the electric power spectral density of chorus waves decreases significantly, mainly manifesting as lower band chorus waves with oblique propagation (θ>60°). With increasing magnetic latitude (λMLAT), the upper band chorus waves diminish rapidly, and the electric power spectral density of the lower band chorus waves at θ≈35° also gradually decreases. This study reveals the distribution characteristics of chorus wave intensity in terms of frequency and the normal angle in different regions, providing crucial information for constructing a more accurate global model of chorus wave-electron interactions.

     

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