Source of the low-altitude hiss in the ionosphere

0477291 - ÚFA 2018 RIV US eng J - Článek v odborném periodiku
Chen, L. - Santolík, Ondřej - Hájoš, Mychajlo - Zheng, L. - Zhima, Z. - Heelis, R. - Hanzelka, Miroslav - Horne, R. B. - Parrot, M.
Source of the low-altitude hiss in the ionosphere.
Geophysical Research Letters. Roč. 44, č. 5 (2017), s. 2060-2069. ISSN 0094-8276. E-ISSN 1944-8007
Grant CEP: GA ČR(CZ) GA17-07027S; GA MŠMT(CZ) LH15304
Grant ostatní: AV ČR(CZ) AP1401
Program: Akademická prémie - Praemium Academiae
Institucionální podpora: RVO:68378289
Klíčová slova: ionospheric hiss * low-altitude hiss * plasmaspheric hiss * ray tracing
Obor OECD: Fluids and plasma physics (including surface physics)
Impakt faktor: 4.339, rok: 2017
http://onlinelibrary.wiley.com/doi/10.1002/2016GL072181/full

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 approximate to f(cH+). 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.
Trvalý link: http://hdl.handle.net/11104/0273674