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Alpha transmitter signal reflection and triggered emissions
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  • Wenyao Gu,
  • Lunjin Chen,
  • Zhiyang Xia,
  • Xin An,
  • Richard B. Horne
Wenyao Gu
University of Texas at Dallas

Corresponding Author:[email protected]

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Lunjin Chen
University of Texas at Dallas
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Zhiyang Xia
University of Texas at Dallas
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Xin An
University of California Los Angeles
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Richard B. Horne
British Antarctic Survey
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Russian Alpha radio navigation system (RSDN-20) emits F1=11.9kHz signals into the magnetosphere which propagate as whistler-mode waves. Observed by waveform continuous burst mode from EMFISIS on Van Allen Probes, a case is presented and featured with ducted propagation, multiple reflections and triggered emissions. Both risers and fallers appear in the triggered emissions. We use a ray-tracing method to demonstrate ducted propagation, which has a similar wave normal angle near $150^{\circ}$ as the observation. The arrival time of reflected signals is estimated using propagation analysis and compared with the observed signal arrival time. To test the non-linear cyclotron resonance theory, the order of chirping rate in triggered emission is estimated. The estimated order agrees with the observation.
16 Dec 2020Published in Geophysical Research Letters volume 47 issue 23. 10.1029/2020GL090165