Počet záznamů: 1
Early-Time Non-Equilibrium Pitch Angle Diffusion of Electrons by Whistler-Mode Hiss in a Plasmaspheric Plume Associated with BARREL Precipitation
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SYSNO ASEP 0550192 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Early-Time Non-Equilibrium Pitch Angle Diffusion of Electrons by Whistler-Mode Hiss in a Plasmaspheric Plume Associated with BARREL Precipitation Tvůrce(i) Millan, R.M. (US)
Ripoll, J.-F. (FR)
Santolík, Ondřej (UFA-U) RID, ORCID
Kurth, W. S. (US)Celkový počet autorů 4 Číslo článku 776992 Zdroj.dok. Frontiers in Astronomy and Space Sciences
Roč. 8, Dec 2 (2021)Poč.str. 11 s. Jazyk dok. eng - angličtina Země vyd. CH - Švýcarsko Klíč. slova electron precipitation ; plasmaspheric plume ; quasi-linear diffusion ; radiation belt ; wave-particle interaction ; whistler-mode hiss/chorus 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 000730953800001 EID SCOPUS 85121335782 DOI 10.3389/fspas.2021.776992 Anotace In August 2015, the Balloon Array for Radiation belt Relativistic Electron Losses (BARREL) observed precipitation of energetic ( < 200 keV) electrons magnetically conjugate to a region of dense cold plasma as measured by the twin Van Allen Probes spacecraft. The two spacecraft passed through the high density region during multiple orbits, showing that the structure was spatial and relatively stable over many hours. The region, identified as a plasmaspheric plume, was filled with intense hiss-like plasma waves. We use a quasi-linear diffusion model to investigate plume whistler-mode hiss waves as the cause of precipitation observed by BARREL. The model input parameters are based on the observed wave, plasma and energetic particle properties obtained from Van Allen Probes. Diffusion coefficients are found to be largest in the same energy range as the precipitation observed by BARREL, indicating that the plume hiss waves were responsible for the precipitation. The event-driven pitch angle diffusion simulation is also used to investigate the evolution of the electron phase space density (PSD) for different energies and assumed initial pitch angle distributions. The results show a complex temporal evolution of the phase space density, with periods of both growth and loss. The earliest dynamics, within the similar to 5 first minutes, can be controlled by a growth of the PSD near the loss cone (by a factor up to similar to 2, depending on the conditions, pitch angle, and energy), favored by the absence of a gradient at the loss cone and by the gradients of the initial pitch angle distribution. Global loss by 1-3 orders of magnitude (depending on the energy) occurs within the first similar to 100 min of wave-particle interaction. The prevalence of plasmaspheric plumes and detached plasma regions suggests whistler-mode hiss waves could be an important driver of electron loss even at high L-value (L similar to 6), outside of the main plasmasphere. 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://www.frontiersin.org/articles/10.3389/fspas.2021.776992/full
Počet záznamů: 1