Saved in:
| Main Authors: | , , , |
|---|---|
| Format: | Recurso digital |
| Sprog: | |
| Udgivet: |
Zenodo
2021
|
| Fag: | |
| Online adgang: | https://doi.org/10.5281/zenodo.18628949 |
| Tags: |
Tilføj Tag
Ingen Tags, Vær først til at tagge denne postø!
|
Indholdsfortegnelse:
- Whistlers generated by lightning have been observed in the magnetosphere of Saturn by the Cassini Radio and Plasma Wave Science Investigation (RPWS). Two whistlers were observed as the spacecraft flew over the rings on July 1, 2004, and the third was observed on October 28, 2004, during the inbound pass of orbit at a radial distance of 6.18 Rs (Saturn radii). The effect of cold plasma injection on whistler mode instability has been studied for ring distribution function with perpendicular AC electric field. The dispersion relation of the parallel propagating electromagnetic whistler mode wave has been applied to the magnetosphere of Saturn. An expression for the growth rate of a system with added cold plasma injection has been calculated. The effects of electron density, number density, temperature anisotropy, A.C frequency and relativistic factor on the growth rate of whistler mode emission were investigated. The observation is in very good agreement with the results. Analysis shows that an increase in temperature anisotropy, A.C. frequency, and energy density increases the rate of increase in whistler waves with significant changes in wavenumbers. It has been shown that whistler mode waves have increased due to the loss of vertical kinetic energy of the ring electrons. In Saturn's magnetosphere, calculations were made at a radial distance of 6.18 Rs. This result is important for the analysis of VLF emissions observed over a broad spectrum of frequencies in the Saturn magnetosphere.