Počet záznamů: 1
Full-wave modeling of EMIC wave packets: ducted propagation and reflected waves
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SYSNO ASEP 0578074 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Full-wave modeling of EMIC wave packets: ducted propagation and reflected waves Tvůrce(i) Hanzelka, Miroslav (UFA-U) ORCID, RID
Li, W. (US)
Ma, Q. (US)
Qin, M. (US)
Shen, X. (US)
Capannolo, L. (US)
Gan, L. (US)Celkový počet autorů 7 Číslo článku 1251563 Zdroj.dok. Frontiers in Astronomy and Space Sciences
Roč. 10, Oct. (2023)Poč.str. 19 s. Jazyk dok. eng - angličtina Země vyd. CH - Švýcarsko Klíč. slova EMIC waves ; wave propagation properties ; full-wave simulation ; mode conversion ; ducted waves ; reflected waves ; cold plasma ; Earth's inner magnetosphere Frontiers Vědní obor RIV BL - Fyzika plazmatu a výboje v plynech Obor OECD Fluids and plasma physics (including surface physics) Způsob publikování Open access Institucionální podpora UFA-U - RVO:68378289 UT WOS 001088049500001 EID SCOPUS 85174954468 DOI 10.3389/fspas.2023.1251563 Anotace Electromagnetic ion cyclotron (EMIC) waves can scatter radiation belt electrons with energies of a few hundred keV and higher. To accurately predict this scattering and the resulting precipitation of these relativistic electrons on short time scales, we need detailed knowledge of the wave field's spatio-temporal evolution, which cannot be obtained from single spacecraft measurements. Our study presents EMIC wave models obtained from two-dimensional (2D) finite-difference time-domain (FDTD) simulations in the Earth's dipole magnetic field. We study cases of hydrogen band and helium band wave propagation, rising-tone emissions, packets with amplitude modulations, and ducted waves. We analyze the wave propagation properties in the time domain, enabling comparison with in situ observations. We show that cold plasma density gradients can keep the wave vector quasiparallel, guide the wave energy efficiently, and have a profound effect on mode conversion and reflections. The wave normal angle of unducted waves increases rapidly with latitude, resulting in reflection on the ion hybrid frequency, which prohibits propagation to low altitudes. The modeled wave fields can serve as an input for test-particle analysis of scattering and precipitation of relativistic electrons and energetic ions. Pracoviště Ústav fyziky atmosféry Kontakt Kateřina Adamovičová, adamovicova@ufa.cas.cz, Tel.: 272 016 012 ; Kateřina Potužníková, kaca@ufa.cas.cz, Tel.: 272 016 019 Rok sběru 2024 Elektronická adresa https://www.frontiersin.org/articles/10.3389/fspas.2023.1251563/full
Počet záznamů: 1