Trapping of whistler-waves through the side of ducts

Strangeways, H.J.; Rycroft, M.J.. 1980 Trapping of whistler-waves through the side of ducts. Journal of Atmospheric and Terrestrial Physics, 42 (11-12). 983-994. 10.1016/0021-9169(80)90112-9

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Official URL: http://dx.doi.org/10.1016/0021-9169(80)90112-9

Abstract/Summary

It is shown that, when the whistler-mode phase refractive index is plotted along the length of geomagnetic field lines as a function of altitude, there is a minimum at an altitude of between 1400 and 2200 kms depending on magnetospheric model and wave frequency. Ray-tracing calculations are presented which show that the wave normal direction of upgoing whistler-mode waves can become field-aligned at and above the altitude of the refractive index minimum and this can lead to trapping of waves through the side of a suitably positioned duct. The mechanism is made possible by the increase of refractive index along the duct length above the altitude of the refractive index minimum. Ray paths resulting from trapping by this mechanism in both a winter night and a summer day model of the magnetospheric plasma are presented and discussed.

Item Type:	Publication - Article
Digital Object Identifier (DOI):	10.1016/0021-9169(80)90112-9
ISSN:	00219169
Date made live:	10 Sep 2019 10:40 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/525042

Item Type:

Publication - Article

Digital Object Identifier (DOI):

10.1016/0021-9169(80)90112-9

ISSN:

00219169

Date made live:

10 Sep 2019 10:40 +0 (UTC)

URI:

https://nora.nerc.ac.uk/id/eprint/525042