Source of the low-altitude hiss in the ionosphere

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.

Details

Publication status:
Published
Author(s):
Authors: Chen, Lunjin, Santolík, Ondrej, Hajoš, Mychajlo, Zheng, Liheng, Zhima, Zeren, Heelis, Roderick, Hanzelka, Miroslav, Horne, Richard B. ORCIDORCID record for Richard B. Horne, Parrot, Michel

On this site: Richard Horne
Date:
16 March, 2017
Journal/Source:
Geophysical Research Letters / 44
Page(s):
2060-2069
Digital Object Identifier (DOI):
https://doi.org/10.1002/2016GL072181