Počet záznamů: 1
Measurability of the Nonlinear Response of Electron Distribution Function to Chorus Emissions in the Earth's Radiation Belt
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SYSNO ASEP 0545648 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Measurability of the Nonlinear Response of Electron Distribution Function to Chorus Emissions in the Earth's Radiation Belt Tvůrce(i) Hanzelka, Miroslav (UFA-U) ORCID, RID
Santolík, Ondřej (UFA-U) RID, ORCID
Omura, Y. (JP)
Kolmašová, Ivana (UFA-U) RID, ORCIDCelkový počet autorů 4 Číslo článku e2021JA029624 Zdroj.dok. Journal of Geophysical Research-Space Physics. - : Wiley - ISSN 2169-9380
Roč. 126, č. 9 (2021)Poč.str. 20 s. Jazyk dok. eng - angličtina Země vyd. US - Spojené státy americké Klíč. slova whistler-mode chorus ; test particle simulation ; nonlinear interaction ; electromagnetic hole ; particle measurements 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 000702340700039 EID SCOPUS 85115794928 DOI 10.1029/2021JA029624 Anotace We conduct test particle simulations to study the perturbations in a hot electron velocity distribution caused by a rising chorus element propagating parallel to the ambient magnetic field in the Earth's outer radiation belt. The wavefield is constructed from the nonlinear growth theory of chorus emissions of Omura (2021, https://doi.org/10.1186/s40623-021-01380-w), with additional considerations about saturation and propagation of the transverse resonant current being applied to model the subpacket structure. Using Liouville's theorem, we trace electrons back in time to reconstruct the evolution of electron velocity distribution at the magnetic equator. The electromagnetic hole created by nonlinear trapping and transport effects appears as a depression in the velocity distribution, aligned with the resonance velocity curve. We analyze the decrease of particle flux in this depression and estimate the energy resolution, pitch angle resolution, time resolution and geometric factor of particle analyzers needed to observe the perturbation. We conclude that particle detectors on current or recently operating spacecraft are always lacking in at least one of these parameters, which explains the missing direct observations of sharp phase space density depressions during chorus-electron nonlinear resonant interaction. However, with a dedicated experiment and appropriate measurement strategy, such observations are within the possibilities of the current technology. Similarity of the simulated density perturbation and a step function mathematical model is used to draw an analogy between the backward wave oscillator regime of chorus generation and the nonlinear growth theory. 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 2022 Elektronická adresa https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2021JA029624
Počet záznamů: 1