Resolving Magnetopause Shadowing Using Multimission Measurements of Phase Space Density

Staples, F. A., Kellerman, A., Murphy, Kyle, Rae, Jonathan, Sandhu, Jasmine and Forsyth, C. (2022) Resolving Magnetopause Shadowing Using Multimission Measurements of Phase Space Density. Journal of Geophysical Research: Space Physics, 127 (2). e2021JA029298. ISSN 2169-9380

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Loss mechanisms act independently or in unison to drive rapid loss of electrons in the radiation belts. Electrons may be lost by precipitation into the Earth's atmosphere, or through the magnetopause into interplanetary space—a process known as magnetopause shadowing. While magnetopause shadowing is known to produce dropouts in electron flux, it is unclear if shadowing continues to remove particles in tandem with electron acceleration processes, limiting the overall flux increase. We investigated the contribution of shadowing to overall radiation belt fluxes throughout a geomagnetic storm starting on the 7 September 2017. We use new, multimission phase space density calculations to decipher electron dynamics during each storm phase and identify features of magnetopause shadowing during both the net‐loss and the net‐acceleration storm phases on sub‐hour time scales. We also highlight two distinct types of shadowing; “direct,” where electrons are lost as their orbit intersects the magnetopause, and “indirect,” where electrons are lost through ULF wave driven radial transport toward the magnetopause boundary.

Item Type: Article
Additional Information: Funding information: F.A.S. was supported by a Science and Technology Funding Council (STFC) studentship. A.C.K. was supported by the NASA Grants NNX16AG78G, 80NSSC20K1402, and 80NSSC20K1281. K.R.M. was partially funded by the NASA ROSES Guest Investigator 18-HGIO18_2-0122 and Space Weather Operations to Research 18-HSWO2R18-0010. I.J.R. was supported by the NERC Grants NE/P017185/1 and NE/V002554/1 and ST/V006320/1. J.K.S. was supported by the NERC Grants NE/P017185/1 and NE/V002554/1. C.F. was supported by the NERC IRF NE/N014480/1 and Grants NE/P017185/1 and NE/V002554/1.
Subjects: F300 Physics
F500 Astronomy
Department: Faculties > Engineering and Environment > Mathematics, Physics and Electrical Engineering
Depositing User: John Coen
Date Deposited: 28 Jan 2022 08:55
Last Modified: 28 Jan 2022 09:15

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