nerc.ac.uk

Modeling the properties of plasmaspheric hiss: 2. Dependence on the plasma density distribution

Chen, Lunjin; Bortnik, Jacob; Li, Wen; Thorne, Richard M.; Horne, Richard B.. 2012 Modeling the properties of plasmaspheric hiss: 2. Dependence on the plasma density distribution. Journal of Geophysical Research (Space Physics), 117, A05202. 13, pp. 10.1029/2011JA017202

Before downloading, please read NORA policies.
[img]
Preview
Text (An edited version of this paper was published by AGU. Copyright American Geophysical Union.)
jgra21704.pdf - Published Version

Download (2MB) | Preview

Abstract/Summary

Wave propagation plays an important role in linking the chorus source in the plasma trough region and the hiss emission in the plasmasphere. We investigate the dependence of plasmaspheric hiss on the background plasma density, which essentially controls the evolution of chorus after its generation at MLT = 10. The variation of plasma density under study includes variation of the location and width of the plasmapause, and the variation of the density distribution in the trough. We demonstrate that the plasmapause shape does not affect the peak hiss intensity significantly, but it does regulate the hiss intensity near the field-aligned direction. As the plasmasphere contracts or the plasmapause width increases, the field-aligned component of plasmaspheric hiss become relatively more intense, as does the intensity of hiss in the inner region, although the peak hiss intensity remains about the same. The trough density distribution, on the other hand, directly influences the accessibility of chorus rays into plasmasphere, and therefore plays an important role in the peak hiss intensity. As the density gradient in the plasma trough increases toward the plasmasphere, the resulting peak in the hiss intensity can increase by up to 10 dB.

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.1029/2011JA017202
Programmes: BAS Programmes > Polar Science for Planet Earth (2009 - ) > Climate
ISSN: 0148-0227
NORA Subject Terms: Space Sciences
Date made live: 31 May 2012 16:52
URI: http://nora.nerc.ac.uk/id/eprint/18236

Actions (login required)

View Item View Item

Document Downloads

More statistics for this item...