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Storm Time Depletions of Multi-MeV Radiation Belt Electrons Observed at Different Pitch Angles

Drozdov A. Y., N. Aseev, F. Effenberger, D. L. Turner, A. Saikin, Y. Y. Shprits, (2019), Storm Time Depletions of Multi-MeV Radiation Belt Electrons Observed at Different Pitch Angles, J. of Geophys. Res. [Space Physics], doi:10.1029/2019JA027332

Abstract

Abstract During geomagnetic storms, the rapid depletion of the high-energy (several MeV) outer radiation belt electrons is the result of loss to the interplanetary medium through the magnetopause, outward radial diffusion, and loss to the atmosphere due to wave-particle interactions. We have performed a statistical study of 110 storms using pitch angle resolved electron flux measurements from the Van Allen Probes mission and found that inside of the radiation belt (L* = 3 − 5) the number of storms that result in depletion of electrons with equatorial pitch angle αeq = 30∘ is higher than number of storms that result in depletion of electrons with equatorial pitch angle αeq = 75∘. We conclude that this result is consistent with electron scattering by whistler and electromagnetic ion cyclotron waves. At the outer edge of the radiation belt (L* ≥ 5.2) the number of storms that result in depletion is also large (~40–50%), emphasizing the significance of the magnetopause shadowing effect and outward radial transport.

Authors (sorted by name)

Aseev Drozdov Effenberger Saikin Shprits Turner

Journal / Conference

Journal Of Geophysical Research (Space Physics)

Grants

80NSSC18K0663 NNX16AF91G

Bibtex

@article{doi:10.1029/2019JA027332,
author = {Drozdov, A. Y. and Aseev, N. and Effenberger, F. and Turner, D. L. and Saikin, A. and Shprits, Y. Y.},
title = {Storm Time Depletions of Multi-MeV Radiation Belt Electrons Observed at Different Pitch Angles},
journal = {Journal of Geophysical Research: Space Physics},
year = {2019},
volume = {},
number = {},
pages = {},
keywords = {radiation belts, multi-MeV electrons, EMIC waves},
doi = {10.1029/2019JA027332},
url = {https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/2019JA027332},
eprint = {https://agupubs.onlinelibrary.wiley.com/doi/pdf/10.1029/2019JA027332},
abstract = {Abstract During geomagnetic storms, the rapid depletion of the high-energy (several MeV) outer radiation belt electrons is the result of loss to the interplanetary medium through the magnetopause, outward radial diffusion, and loss to the atmosphere due to wave-particle interactions. We have performed a statistical study of 110 storms using pitch angle resolved electron flux measurements from the Van Allen Probes mission and found that inside of the radiation belt (L* = 3 − 5) the number of storms that result in depletion of electrons with equatorial pitch angle αeq = 30∘ is higher than number of storms that result in depletion of electrons with equatorial pitch angle αeq = 75∘. We conclude that this result is consistent with electron scattering by whistler and electromagnetic ion cyclotron waves. At the outer edge of the radiation belt (L* ≥ 5.2) the number of storms that result in depletion is also large (~40–50%), emphasizing the significance of the magnetopause shadowing effect and outward radial transport.}
}