| PHYSICS OF GASES, PLASMAS, AND ELECTRIC DISCHARGES |
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Propagation Characteristics of Whistler-Mode Chorus during Geomagnetic Activities |
| ZHOU Qing-Hua1,2, HE Yi-Hua1, HE Zhao-Guo1, YANG Chang1 |
| 1School of Physics and Electronic Sciences, Changsha University of Science and Technology, Changsha 410004 2State Key Laboratory of Space Weather, Chinese Academy of Sciences, Beijing 100190 |
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ZHOU Qing-Hua, HE Yi-Hua, HE Zhao-Guo et al 2010 Chin. Phys. Lett. 27 055204 |
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Abstract A recently introduced ray-tracing method is adopted to study the propagation characteristics of whistler-mode chorus during different geomagnetic activities by using a global core plasma density model. Numerical calculations show that chorus waves tend to settle on a preferable magnetic shell L in the vicinity of the plasmapause. During high geomagnetic activity, the plasmapause position moves inward close to the Earth and chorus trajectories move inward together with plasmapause. The trajectory move closer to the plasmapause asθ increases. Chorus wave with lower frequencies will reflect multiple times while chorus wave with higher frequencies reflect once at the plasmapause before settling on the vicinity of the plasmapause. The current results present a first detailed study on the propagation characteristics of chorus during geomagnetic activities, and may account for the observation that chorus tends to be present in the vicinity of the plasmapause.
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| Keywords:
52.35.Hr
94.30.Lr
94.30.Tz
94.20.Wj
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Received: 17 August 2009
Published: 23 April 2010
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| PACS: |
52.35.Hr
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(Electromagnetic waves (e.g., electron-cyclotron, Whistler, Bernstein, upper hybrid, lower hybrid))
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94.30.Lr
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(Magnetic storms, substorms)
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94.30.Tz
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(Electromagnetic wave propagation)
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94.20.wj
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(Wave/particle interactions)
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