Statistical analysis of MMS observations of energetic electron escape observed at/beyond the dayside magnetopause

Cohen, Ian J.; Mauk, Barry H.; Anderson, Brian J.; Westlake, Joseph H.; Sibeck, David G.; Turner, Drew L.; Fennell, Joseph F.; Blake, J. Bern; Jaynes, Allison N.; Leonard, Trevor W.; Baker, Daniel N.; Spence, Harlan E.; Reeves, Geoffrey D.; Giles, Barbara J.; Strangeway, Robert J.; Torbert, Roy B.; Burch, James L.

doi:10.1002/2017JA024401

Statistical analysis of MMS observations of energetic electron escape observed at/beyond the dayside magnetopause

Journal Article · Tue Aug 01 00:00:00 EDT 2017 · Journal of Geophysical Research. Space Physics

DOI:https://doi.org/10.1002/2017JA024401· OSTI ID:1402653

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The Johns Hopkins Univ. Applied Physics Lab., Laurel, MD (United States)
NASA Goddard Space Flight Center, Greenbelt, MD (United States)
The Aerospace Corporation, El Segundo, CA (United States)
Lab. for Atmospheric and Space Physics, Boulder, CO (United States)
Univ. of New Hampshire, Durham, NH (United States)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Univ. of California, Los Angeles, CA (United States)
Univ. of New Hampshire, Durham, NH (United States); Southwest Research Institute, San Antonio, TX (United States)
Southwest Research Institute, San Antonio, TX (United States); Univ. of Texas at San Antonio, San Antonio, TX (United States)

Here, observations from the Energetic Particle Detector (EPD) instrument suite aboard the Magnetospheric Multiscale (MMS) spacecraft show that energetic (greater than tens of keV) magnetospheric particle escape into the magnetosheath occurs commonly across the dayside. This includes the surprisingly frequent observation of magnetospheric electrons in the duskside magnetosheath, an unexpected result given assumptions regarding magnetic drift shadowing. The 238 events identified in the 40 keV electron energy channel during the first MMS dayside season that exhibit strongly anisotropic pitch angle distributions indicating monohemispheric field-aligned streaming away from the magnetopause. A review of the extremely rich literature of energetic electron observations beyond the magnetopause is provided to place these new observations into historical context. Despite the extensive history of such research, these new observations provide a more comprehensive data set that includes unprecedented magnetic local time (MLT) coverage of the dayside equatorial magnetopause/magnetosheath. These data clearly highlight the common escape of energetic electrons along magnetic field lines concluded to have been reconnected across the magnetopause. While these streaming escape events agree with prior studies which show strong correlation with geomagnetic activity (suggesting a magnetotail source) and occur most frequently during periods of southward IMF, the high number of duskside events is unexpected and previously unobserved. Although the lowest electron energy channel was the focus of this study, the events reported here exhibit pitch angle anisotropies indicative of streaming up to 200 keV, which could represent the magnetopause loss of >1 MeV electrons from the outer radiation belt.

View Accepted Manuscript (DOE)

Research Organization:: Los Alamos National Laboratory (LANL)

Sponsoring Organization:: NASA; USDOE

Grant/Contract Number:: AC52-06NA25396

OSTI ID:: 1402653

Report Number(s):: LA-UR-17-28034

Journal Information:: Journal of Geophysical Research. Space Physics, Journal Name: Journal of Geophysical Research. Space Physics Journal Issue: 9 Vol. 122; ISSN 2169-9380

Publisher:: American Geophysical UnionCopyright Statement

Country of Publication:: United States

Language:: English

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