Modeling the Effects of Drift Orbit Bifurcation on the Magnetopause Shadowing Loss of Radiation Belt Electrons

Huang, Jinbei; Lyu, Xingzhi; Tu, Weichao; Albert, Jay M.; Lee, Sang‐Yun

doi:10.1029/2023GL106359

Title: Modeling the Effects of Drift Orbit Bifurcation on the Magnetopause Shadowing Loss of Radiation Belt Electrons

Journal Article · Tue Dec 19 00:00:00 EST 2023 · Geophysical Research Letters

DOI:https://doi.org/10.1029/2023GL106359· OSTI ID:2246662

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Department of Physics and Astronomy West Virginia University Morgantown WV USA
Air Force Research Laboratory Kirtland AFB Albuquerque NM USA

Abstract Last closed drift shell (LCDS) has been identified as a crucial parameter for investigating the magnetopause shadowing loss of radiation belt electrons. However, drift orbit bifurcation (DOB) effects have not been physically incorporated into the LCDS calculation. Here we calculate event‐specific LCDS using different approaches to dealing with the DOB effects, that is, tracing field lines ignoring DOB, tracing test particles rejecting field lines with DOB, and tracing particles including field lines with DOB, and then incorporate them into a radial diffusion model to simulate the fast electron dropout observed by Van Allen Probes in May 2017. The model effectively captures the fast dropout at high L* and exhibits the best agreement with data when LCDS is calculated by tracing test particles with DOB more physically included. This study represents the first quantitative modeling of the DOB effects on radiation belt magnetopause shadowing loss via a more physical specification of LCDS.

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Sponsoring Organization:: USDOE

Grant/Contract Number:: DE‐SC0020294

OSTI ID:: 2246662

Alternate ID(s):: OSTI ID: 2246663

Journal Information:: Geophysical Research Letters, Journal Name: Geophysical Research Letters Vol. 50 Journal Issue: 24; ISSN 0094-8276

Publisher:: American Geophysical Union (AGU)Copyright Statement

Country of Publication:: United States

Language:: English

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