Observations and simulations of non-local acceleration of electrons in magnetotail magnetic reconnection events

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https://www.nature.com/articles/nphys1903

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https://doi.org/10.1038/nphys1903
 http://hdl.handle.net/11603/30811

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UMBC Goddard Planetary Heliophysics Institute (GPHI)
UMBC Faculty Collection
UMBC GESTAR II

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Author/Creator ORCID

https://orcid.org/0000-0002-5317-988X
 https://orcid.org/0000-0001-9583-8882

Date

2011-01-30

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journal articles
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Citation of Original Publication

Ashour-Abdalla, M., El-Alaoui, M., Goldstein, M. et al. Observations and simulations of non-local acceleration of electrons in magnetotail magnetic reconnection events. Nature Phys 7, 360–365 (2011). https://doi.org/10.1038/nphys1903

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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.
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Abstract

Magnetic reconnection in magnetized plasmas represents a change in magnetic field topology and is associated with a concomitant energization of charged particles that results from a conversion of magnetic energy into particle energy. In Earth’s magnetosphere this process is associated with the entry of the solar wind into the magnetosphere and with the initiation of auroral substorms. Using data from the THEMIS mission, together with global and test particle simulations, we demonstrate that electrons are energized in two distinct regions: a low-energy population (less than or equal to a few kiloelectronvolts) that arises in a diffusion region where particles are demagnetized and the magnetic topology changes, and a high-energy component (approaching 100 keV) that results from betatron acceleration within dipolarization fronts that sweep towards the inner magnetosphere far from the diffusion region. Thus, the observed particle energization is associated with both magnetic reconnection and with betatron acceleration associated with macroscopic flows.