Ray-tracing interpretation of wave normal directions of chorus emissions observed in the off-equatorial region of the outer magnetosphere

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概要

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• The previous direction finding measurements of chorus emissions with different spectral shapes (rising, falling, and constant tones) near the equator have indicated that those chorus emissions are generated around the equator with their wave normals being nearly aligned with the magnetic field in terms of the Cyclotron instability by energetic electrons. Their subsequent propagation in the outer magnetosphere is discussed in the present paper. First, the results of wave normal directions of chorus observed in the off-equatorial regions are reviewed; one from OGO 5 measurement and the other, our GEOS 1 result. These measurements are compared with the results of two-dimensional ray-tracing analyses for a realistic model of the outer magnetosphere. Finally, it is found that the subsequent propagation of chorus after the equatorial generation, is, on some occasions, ducted, and it is non-ducted on other occasions.

• 国立極地研究所の論文

著者

• Hattori Katsumi

  Research Institute of Atmospherics, Nagoya University

• Hattori Katsumi

  Research Institute Of Atmospherics Nagoya University

• Hayakawa Masashi

  Research Institute Of Atmospherics Nagaya University

• Ishikawa Kiyohiko

  Research Institute of Atmospherics, Nagoya University

• Ishikawa Kiyohiko

  Research Institute Of Atmospherics Nagoya University

関連論文

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• The wave normal directions of chorus emissions in the outer magnetosphere
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• Scattering of Electromagnetic Waves by Cylindrical Irregularity Immersed in a Plasma at Oblique Incidence
• The wave distribution functions of plasmaspheric ELF hiss: GEOS 1 observation in the equatorial region
• An Observing Plan of Wave Normal Direction of Auroral VLF Emissions on Board a Rocket at Syawa Station
• Study of Auroral VLF Hiss Observed at Syowa Station, Antarctica
• Ray-tracing interpretation of wave normal directions of chorus emissions observed in the off-equatorial region of the outer magnetosphere
• On the Polarization of Half-Gyrofrequency Whistler-Mode Waves in the Two-Component Magnetospheric Plasma
• Direction finding of half-gyrofrequency VLF emissions in the off-equatorial region of the magnetosphere
• The generation mechanism of ELF hiss in detached plasma regions of the magnetosphere, as based on the direction finding results
• Characteristics of substorm-associated VLF/ELF emissions at medium latitudes

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