Temporal, Spatial, and Velocity-Space Variations of Electron Phase Space Density Measurements at the Magnetopause

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JGR Space Physics - 2023 - Shuster - Temporal Spatial and Velocity‐Space Variations of Electron Phase Space Density.pdf (5.67 MB)

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https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2022JA030949

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https://doi.org/10.1029/2022JA030949
 http://hdl.handle.net/11603/30949

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UMBC Goddard Planetary Heliophysics Institute (GPHI)
UMBC Faculty Collection

Author/Creator

Author/Creator ORCID

https://orcid.org/0000-0001-7537-3539

Date

2023-03-21

Type of Work

journal articles
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Citation of Original Publication

Shuster, J. R., Gershman, D. J., Giles, B. L., Bessho, N., Sharma, A. S., Dorelli, J. C., et al. (2023). Temporal, spatial, and velocity-space variations of electron phase space density measurements at the magnetopause. Journal of Geophysical Research: Space Physics, 128, e2022JA030949. https://doi.org/10.1029/2022JA030949

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This work was written as part of one of the author's official duties as an Employee of the United States Government and is therefore a work of the United States Government. In accordance with 17 U.S.C. 105, no copyright protection is available for such works under U.S. Law.
Public Domain Mark 1.0

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Abstract

Temporal, spatial, and velocity-space variations of electron phase space density are measured observationally and compared for the first time using the four magnetospheric multiscale (MMS) spacecraft at Earth's magnetopause. Equipped with these unprecedented spatiotemporal measurements offered by the MMS tetrahedron, we compute each term of the electron Vlasov equation that governs the evolution of collisionless plasmas found throughout the universe. We demonstrate how to use single spacecraft measurements to improve the resolution of the electron pressure gradient that supports nonideal parallel electric fields, and we develop a model to intuit the types of kinetic velocity-space signatures that are observed in the Vlasov equation terms. Furthermore, we discuss how the gradient in velocity-space sheds light on plasma energy conversion mechanisms and wave-particle interactions that occur in fundamental physical processes such as magnetic reconnection and turbulence.