Magnetospheric whistler mode ray tracing in a warm background plasma with finite electron and ion temperature
| Autor: | Ashanthi Maxworth, Marek Gołkowski |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Physics
010504 meteorology & atmospheric sciences Whistler Magnetosphere Plasmasphere Electron Plasma 01 natural sciences Geophysics Physics::Plasma Physics Space and Planetary Science Physics::Space Physics 0103 physical sciences Group velocity Landau damping Atomic physics 010303 astronomy & astrophysics Refractive index 0105 earth and related environmental sciences |
| Zdroj: | Journal of Geophysical Research: Space Physics. 122:7323-7335 |
| ISSN: | 2169-9402 2169-9380 |
| DOI: | 10.1002/2016ja023546 |
| Popis: | Whistler mode waves play a major role in the energy dynamics of the Earth's magnetosphere. Numerical raytracing has been used for many years to determine the propagation trajectories of whistler mode waves from various sources, both natural and anthropogenic. Previous work has been under the ideal cold plasma assumption even though temperatures of the background ions and electrons are in the range of several eV. We perform numerical raytracing with the inclusion of finite electron and ion temperatures to more accurately model the plasma environment of the Earth's magnetosphere. Finite temperature effects are found to play a significant role in the whistler mode refractive index surface only when the wave frequency is near the lower hybrid resonance frequency and the wave normal angle is oblique. In such cases, the primary effect on whistler mode propagation is to lower the refractive index magnitude and increase the group velocity with slight modifications to the ray trajectories. Landau damping is shown to increase slightly with the inclusion of finite temperature. |
| Databáze: | OpenAIRE |
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