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Source of the low-altitude hiss in the ionosphere

Chen, Lunjin; Santolík, Ondrej; Hajoš, Mychajlo; Zheng, Liheng; Zhima, Zeren; Heelis, Roderick; Hanzelka, Miroslav; Horne, Richard B.; Parrot, Michel. 2017 Source of the low-altitude hiss in the ionosphere. Geophysical Research Letters, 44 (5). 2060-2069. https://doi.org/10.1002/2016GL072181

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Abstract/Summary

We analyze the propagation properties of low-altitude hiss emission in the ionosphere observed by DEMETER (Detection of Electromagnetic Emissions Transmitted from Earthquake Regions). There exist two types of low-altitude hiss: type I emission at high latitude is characterized by vertically downward propagation and broadband spectra, while type II emission at low latitude is featured with equatorward propagation and a narrower frequency band above ∼fcH+. Our ray tracing simulation demonstrates that both types of the low-altitude hiss at different latitude are connected and they originate from plasmaspheric hiss and in part chorus emission. Type I emission represents magnetospheric whistler emission that accesses the ionosphere. Equatorward propagation associated with type II emission is a consequence of wave trapping mechanisms in the ionosphere. Two different wave trapping mechanisms are identified to explain the equatorial propagation of Type II emission; one is associated with the proximity of wave frequency and local proton cyclotron frequency, while the other occurs near the ionospheric density peak.

Item Type: Publication - Article
Digital Object Identifier (DOI): https://doi.org/10.1002/2016GL072181
Programmes: BAS Programmes > BAS Programmes 2015 > Space Weather and Atmosphere
ISSN: 00948276
Additional Keywords: ionospheric hiss, low-altitude hiss, plasmaspheric hiss, ray tracing
Date made live: 18 Apr 2017 13:51 +0 (UTC)
URI: http://nora.nerc.ac.uk/id/eprint/516874

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