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How whistler mode hiss waves and the plasmasphere drive the quiet decay of radiation belts electrons following a geomagnetic storm
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SYSNO ASEP 0559271 Document Type C - Proceedings Paper (int. conf.) R&D Document Type Conference Paper Title How whistler mode hiss waves and the plasmasphere drive the quiet decay of radiation belts electrons following a geomagnetic storm Author(s) Ripoll, J.-F. (FR)
Denton, M. (US)
Loridan, V. (FR)
Santolík, Ondřej (UFA-U) RID, ORCID
Malaspina, D. (US)
Hartley, D. P. (US)
Cunningham, G. S. (US)
Reeves, G. (US)
Thaller, S. (US)
Turner, D. L. (US)
Fennell, J.F. (US)
Drozdov, A.Y. (US)
Villa, J. S. C. (DE)
Shprits, Y. Y. (US)
Chu, X. (US)
Hospodarsky, G. (US)
Kurth, W. S. (US)
Kletzing, C. A. (US)
Wygant, J. (US)
Henderson, M. G. (US)
Ukhorskiy, A. Y. (US)Number of authors 21 Article number 012005 Source Title Journal of Physics: Conference Series, Proceedings of the 14th International Conference on Numerical Modeling of Space Plasma Flows: ASTRONUM 2019, 1623. - Bristol : IOP Publishing, 2020 - ISSN 1742-6588 Number of pages 11 s. Publication form Online - E Action ASTRONUM 2019 Event date 01.07.2019 - 05.07.2019 VEvent location Paris Country FR - France Event type WRD Language eng - English Country GB - United Kingdom Keywords wave-particle interactions ; radiation belt electrons ; whistler-mode hiss waves Subject RIV BL - Plasma and Gas Discharge Physics OECD category Fluids and plasma physics (including surface physics) Institutional support UFA-U - RVO:68378289 UT WOS 000630893100005 EID SCOPUS 85092799086 DOI https://doi.org/10.1088/1742-6596/1623/1/012005 Annotation We show how an extended period of quiet solar wind conditions contributes to a quiet state of the plasmasphere that expands up to L similar to 5.5, which creates the perfect conditions for wave-particle interactions between the radiation belt electrons and whistler-mode hiss waves. The correlation between the hiss waves and the plasma density is direct with hiss wave power increasing with plasma density, while it was generally assumed that these quantities can be specified independently. Whistler-mode hiss waves pitch angle diffuse and ultimately scatter freshly injected electrons into the atmosphere until the slot region is formed between the inner and outer belt and the outer belt is drastically reduced. In this study, we use and combine Van Allen Probes observations and Fokker-Planck numerical simulations. The Fokker-Planck model uses consistent event-driven pitch angle diffusion coefficients from whistler-mode hiss waves. Observations and simulations allow us to reach a global understanding of the variations in the trapped electron population with time, space, energy, and pitch angle that is based on the existing theory of quasi-linear wave-particle interactions. We show, for instance, the outer beltis pitch-angle homogeneous, which is explained by the event-driven diffusion coefficients that are roughly constant for equatorial pitch angle α0~60°, E100 keV, 3.5<L<Lpp~6. The impact of this work is to bring an improved understanding of the belt evolution based on the integration of high quality and highly temporally and spatially resolved measurements that are integrated in modern computations. We also propose the event-driven method as an accurate method (within ×2) to predict the electron flux decay after storms. 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://iopscience.iop.org/article/10.1088/1742-6596/1623/1/012005/pdf
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