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| Titel |
Ray tracing of whistler-mode chorus elements: implications for generation mechanisms of rising and falling tone emissions |
| VerfasserIn |
K. Yamaguchi, T. Matsumuro, Y. Omura, D. Nunn |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 31, no. 4 ; Nr. 31, no. 4 (2013-04-12), S.665-673 |
| Datensatznummer |
250019023
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| Publikation (Nr.) |
 copernicus.org/angeo-31-665-2013.pdf |
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| Zusammenfassung |
| Using a well-established magnetospheric very-low-frequency (VLF) ray tracing method, in this work
we trace the propagation of individual rising- and falling-frequency elements
of VLF chorus from their generation point in the equatorial region of the
magnetosphere through to at least one reflection at the lower-hybrid
resonance point. Unlike recent work by Bortnik and co-workers, whose
emphasis was on demonstrating that magnetospheric hiss has its origins in
chorus, we here track the motion in the equatorial plane of the whole chorus
element, paying particular regard to movement across field lines, rotation,
and compression or expansion of the wave pulse. With a generation point for
rising chorus at the equator, it was found the element wave pulse remained
largely field aligned in the generation region. However, for a falling tone
generation point at 4000 km upstream from the equator, by the time the pulse
crosses the equator the wavefield had substantial obliquity, displacement,
and compression, which has substantial implications for the theory of falling
chorus generation. |
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