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Alpha Transmitter Signals Observed by the Van Allen Probes: Ducted Versus Nonducted Propagation
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SYSNO ASEP 0558677 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Alpha Transmitter Signals Observed by the Van Allen Probes: Ducted Versus Nonducted Propagation Author(s) Němec, F. (CZ)
Santolík, Ondřej (UFA-U) RID, ORCID
Hospodarsky, G. B. (US)
Kurth, W. S. (US)Number of authors 4 Article number e2022GL098328 Source Title Geophysical Research Letters. - : Wiley - ISSN 0094-8276
Roč. 49, č. 12 (2022)Number of pages 10 s. Language eng - English Country US - United States Keywords vlf ; emissions ; model ; Alpha transmitters ; ducted ; nonducted ; wave analysis Subject RIV BL - Plasma and Gas Discharge Physics OECD category Fluids and plasma physics (including surface physics) Method of publishing Limited access Institutional support UFA-U - RVO:68378289 UT WOS 000813623100001 EID SCOPUS 85133000898 DOI 10.1029/2022GL098328 Annotation The interaction of very low frequency transmitter signals with radiation belt electrons depends ultimately on their wave normal angles. In the equatorial interaction region, these can be either low (ducted propagation) or comparatively large (nonducted propagation). Experimentally distinguishing the two modes is complicated, as multicomponent spacecraft data typically do not extend to high enough frequencies with a sufficient frequency resolution. One exception that we exploit are 11.9 kHz signals from Alpha transmitters detectable by the Van Allen Probes spacecraft. We use multicomponent burst mode measurements to distinguish between the ducted and nonducted modes of propagation and to evaluate their relative importance. While the ducted waves are detected less often, they tend to have larger Poynting fluxes. The total power propagating in the two modes is thus comparable. Magnetic local time and in-situ density fluctuations are main parameters controlling the relative fraction of ducted waves. Workplace Institute of Atmospheric Physics Contact Kateřina Adamovičová, adamovicova@ufa.cas.cz, Tel.: 272 016 012 ; Kateřina Potužníková, kaca@ufa.cas.cz, Tel.: 272 016 019 Year of Publishing 2023 Electronic address https://agupubs.onlinelibrary.wiley.com/doi/epdf/10.1029/2022GL098328
Number of the records: 1