Depletions of Multi‐MeV Electrons and Their Association to Minima in Phase 
Space Density

Drozdov, A. Y.; Allison, Hayley J.; SHPRITS, YURI; Usanova, M. E.; Saikin, A.; Wang, D.

doi:10.1029/2021GL097620

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Depletions of Multi‐MeV Electrons and Their Association to Minima in Phase Space Density

Authors

Drozdov, A. Y.
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/persons/resource/haylis

Allison, Hayley J.
2.7 Space Physics and Space Weather, 2.0 Geophysics, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

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SHPRITS, YURI
2.7 Space Physics and Space Weather, 2.0 Geophysics, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

Usanova, M. E.
External Organizations;

Saikin, A.
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/persons/resource/dedong

Wang, D.
2.7 Space Physics and Space Weather, 2.0 Geophysics, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

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Citation

Drozdov, A. Y., Allison, H. J., SHPRITS, Y., Usanova, M. E., Saikin, A., Wang, D. (2022): Depletions of Multi‐MeV Electrons and Their Association to Minima in Phase Space Density. - Geophysical Research Letters, 49, 8, e2021GL097620.
https://doi.org/10.1029/2021GL097620

Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5011740

Abstract

Fast-localized electron loss, resulting from interactions with electromagnetic ion cyclotron (EMIC) waves, can produce deepening minima in phase space density (PSD) radial profiles. Here, we perform a statistical analysis of local PSD minima to quantify how readily these are associated with radiation belt depletions. The statistics of PSD minima observed over a year are compared to the Versatile Electron Radiation Belts (VERB) simulations, both including and excluding EMIC waves. The observed minima distribution can only be achieved in the simulation including EMIC waves, indicating their importance in the dynamics of the radiation belts. By analyzing electron flux depletions in conjunction with the observed PSD minima, we show that, in the heart of the outer radiation belt (L* < 5), on average, 53% of multi-MeV electron depletions are associated with PSD minima, demonstrating that fast localized loss by interactions with EMIC waves are a common and crucial process for ultra-relativistic electron populations.