Department of Physics and Astronomy West Virginia University Morgantown WV USA
Department of Atmospheric and Oceanic Sciences University of California, Los Angeles Los Angeles CA USA, Center for Space Physics Boston University Boston MA USA
Magnetopause shadowing (MPS) effect could drive a concurrent dropout of radiation belt electrons and ring current protons. However, its relative role in the dropout of both plasma populations has not been well quantified. In this work, we study the simultaneous dropout of MeV electrons and 100s keV protons during an intense geomagnetic storm in May 2017. A radial diffusion model with an event‐specific last closed drift shell is used to simulate the MPS loss of both populations. The model well captures the fast shadowing loss of both populations at L * > 4.6, while the loss at L * < 4.6, possibly due to the electromagnetic ion cyclotron wave scattering, is not captured. The observed butterfly pitch angle distributions of electron fluxes in the initial loss phase are well reproduced by the model. The initial proton losses at low pitch angles are underestimated, potentially also contributed by other mechanisms such as field line curvature scattering.
Lyu, Xingzhi, et al. "Modeling the Simultaneous Dropout of Energetic Electrons and Protons by Magnetopause Shadowing." Geophysical Research Letters, vol. 51, no. 2, Jan. 2024. https://doi.org/10.1029/2023GL106681
Lyu, Xingzhi, Tu, Weichao, Huang, Jinbei, et al., "Modeling the Simultaneous Dropout of Energetic Electrons and Protons by Magnetopause Shadowing," Geophysical Research Letters 51, no. 2 (2024), https://doi.org/10.1029/2023GL106681
@article{osti_2281615,
author = {Lyu, Xingzhi and Tu, Weichao and Huang, Jinbei and Ma, Qianli and Li, Zhi‐Gu},
title = {Modeling the Simultaneous Dropout of Energetic Electrons and Protons by Magnetopause Shadowing},
annote = {Abstract Magnetopause shadowing (MPS) effect could drive a concurrent dropout of radiation belt electrons and ring current protons. However, its relative role in the dropout of both plasma populations has not been well quantified. In this work, we study the simultaneous dropout of MeV electrons and 100s keV protons during an intense geomagnetic storm in May 2017. A radial diffusion model with an event‐specific last closed drift shell is used to simulate the MPS loss of both populations. The model well captures the fast shadowing loss of both populations at L * > 4.6, while the loss at L * },
doi = {10.1029/2023GL106681},
url = {https://www.osti.gov/biblio/2281615},
journal = {Geophysical Research Letters},
issn = {ISSN 0094-8276},
number = {2},
volume = {51},
place = {United States},
publisher = {American Geophysical Union (AGU)},
year = {2024},
month = {01}}
West Virginia University, Morgantown, WV (United States)
Sponsoring Organization:
National Aeronautics and Space Administration (NASA); National Science Foundation (NSF); USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0020294
OSTI ID:
2281615
Alternate ID(s):
OSTI ID: 2341481 OSTI ID: 2282198
Journal Information:
Geophysical Research Letters, Journal Name: Geophysical Research Letters Journal Issue: 2 Vol. 51; ISSN 0094-8276