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Scattering by whistler-mode waves during a quiet period perturbed by substorm activity

We study the dynamics of radiation belt electrons during a 10-day quiet period perturbed by substorm activity and preceding a high-speed stream (HSS), aiming at a global description of the radiation belts in L-shell, L in [2, 6], and energy [0.1, 10] MeV. We combine Van Allen Probes observations and...

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Published in:Journal of atmospheric and solar-terrestrial physics 2021-04, Vol.215 (C), p.105471, Article 105471
Main Authors: Ripoll, J.-F., Denton, M.H., Hartley, D.P., Reeves, G.D., Malaspina, D., Cunningham, G.S., Santolík, O., Thaller, S.A., Loridan, V., Fennell, J.F., Turner, D.L., Kurth, W.S., Kletzing, C.A., Henderson, M.G., Ukhorskiy, A.Y.
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cited_by cdi_FETCH-LOGICAL-c475t-7579a42442f02b60c60ab5a94dc6f6c619b30343424b128aaac4bf76a24b664c3
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creator Ripoll, J.-F.
Denton, M.H.
Hartley, D.P.
Reeves, G.D.
Malaspina, D.
Cunningham, G.S.
Santolík, O.
Thaller, S.A.
Loridan, V.
Fennell, J.F.
Turner, D.L.
Kurth, W.S.
Kletzing, C.A.
Henderson, M.G.
Ukhorskiy, A.Y.
description We study the dynamics of radiation belt electrons during a 10-day quiet period perturbed by substorm activity and preceding a high-speed stream (HSS), aiming at a global description of the radiation belts in L-shell, L in [2, 6], and energy [0.1, 10] MeV. We combine Van Allen Probes observations and Fokker-Planck numerical simulations of pitch-angle diffusion. The Fokker-Planck model uses event-driven pitch angle diffusion coefficients from whistler-mode waves, built from the wave properties and the ambient plasma density measurements from the Van Allen Probes. We first find this event has some similar characteristics to regular quiet times previously studied; a widely extended plasmasphere within which we observe strong and varying whistler-mode waves. These ambient conditions lead to strong pitch-angle scattering, which contributes to the creation of a wide slot region as well as a significant decay of the outer radiation belts, which are observed and qualitatively well simulated. In addition, we find the substorm activity causes short duration (within ± 4h) decay of the plasma density and a lowering amplitude of the whistler-mode waves within the plasmasphere, both causing opposite effects in terms of pitch angle diffusion. This leads to a diminution of pitch-angle diffusion at the time of the main substorm activity. Conversely, whistler-mode waves become enhanced in the time periods between the substorm injections. All effects cumulated, we find an enhancement of pitch angle diffusion by whistler-mode waves above L~4.7 during the 10-day period. This directly relates to the combination of quietness and substorm activity which allows pitch angle diffusing of up to 1 MeV electrons in the outer belt. Relativistic electrons of 1–2 MeV remain trapped in the outer belt, from L~4.7 to L~5.2, forming, in both the observations and the simulations, a distinct pocket of remnant electrons. •Substorm injections cause a decay of the plasma density and whistler-mode hiss waves•Event-driven pitch-angle diffusion decreases at the time of substorm injections•Whistler-mode waves are enhanced in the time periods between the substorm injections•Over 10 days, mean pitch angle diffusion is enhanced by whistler-mode waves at L > 4.7•Quiet and substorm times cause pitch angle-diffusion of outer belt electrons (
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Conversely, whistler-mode waves become enhanced in the time periods between the substorm injections. All effects cumulated, we find an enhancement of pitch angle diffusion by whistler-mode waves above L~4.7 during the 10-day period. This directly relates to the combination of quietness and substorm activity which allows pitch angle diffusing of up to 1 MeV electrons in the outer belt. 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1879-1824
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recordid cdi_osti_scitechconnect_1811095
source ScienceDirect Journals
subjects ASTRONOMY AND ASTROPHYSICS
Electron
Engineering Sciences
heliospheric and magnetospheric physics
Moderate substorm activity
Physics
Radiation belts
Substorm
Wave-particle interactions
Whistler-mode waves
whistler-model waves
title Scattering by whistler-mode waves during a quiet period perturbed by substorm activity
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