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| Titel |
A simulation study of mode conversion process from Upper-Hybrid waves to LO-mode waves in plasmasphere |
| VerfasserIn |
M. J. Kalaee, T. Ono, A. Kumamoto, Y. Katoh, Y. Nishimura |
| Konferenz |
EGU General Assembly 2009
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 11 (2009) |
| Datensatznummer |
250020697
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| Zusammenfassung |
| In order to clarify the role of the mode conversion process in the generation mechanism of
LO-mode waves in the plasmasphere such as kilometric continuum, we have investigated the
mode conversion process among UHR-mode, Z-mode and LO-mode waves by a
numerical simulation solving Maxwell’s equations and the motion equation of a cold
electron fluid. The characteristics of the wave coupling process occurring in the
cold magnetized plasma are examined in detail. In order to improve the model to
actual one, we used the plasma wave data obtained by the Akebono satellite in the
plasmasphere. Density gradient was estimated based on resonance frequency of
UHR_ waves, the indicate wave normal angle was estimated by comparing observed
Ex/Ey with Ex/Ey derived from dispersion relation. Numerical simulation of mode
conversion was, then, performed based on estimated density gradient and incident wave
normal angle. The results are similar with observation. Simulation results show
the radio window, beaming angle of generated LO mode waves, is less than the
prediction of previous theory, which agree to observations of kilometric continuum. |
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