Dipolarizing flux bundles in the cis-geosynchronous magnetosphere: Relationship between electric fields and energetic particle injections

Liu, Jiang; Angelopoulos, V.; Zhang, Xiao-Jia; Turner, D. L.; Gabrielse, C.; Runov, A.; Li, Jinxing; Funsten, Herbert O.; Spence, H. E.

doi:10.1002/2015JA021691

Title: Dipolarizing flux bundles in the cis-geosynchronous magnetosphere: Relationship between electric fields and energetic particle injections

Journal Article · Fri Jan 29 00:00:00 EST 2016 · Journal of Geophysical Research. Space Physics

DOI:https://doi.org/10.1002/2015JA021691· OSTI ID:1473806

Liu, Jiang ^[1]; Angelopoulos, V. ^[1]; Zhang, Xiao-Jia ^[1]; Turner, D. L. ^[2]; Gabrielse, C. ^[1]; Runov, A. ^[1]; Li, Jinxing ^[3];

^[4]; Spence, H. E. ^[5]

Univ. of California, Los Angeles, CA (United States). Dept. of Earth, Planetary and Space Sciences and Inst. of Geophysics and Planetary Physics
Aerospace Corporation, El Segundo, CA (United States)
Univ. of California, Los Angeles, CA (United States). Dept. of Atmospheric and Oceanic Sciences
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Univ. of New Hampshire, Durham, NH (United States). Inst. for the Study of Earth, Oceans, and Space

Dipolarizing flux bundles (DFBs) are small flux tubes (typically <3 R_E in X_GSM and Y_GSM) in the nightside magnetosphere that have magnetic field more dipolar than the background. Although DFBs are known to accelerate particles, creating energetic particle injections outside geosynchronous orbit (trans-GEO), the nature of the acceleration mechanism and the importance of DFBs in generating injections inside geosynchronous orbit (cis-GEO) are unclear. Our statistical study of cis-GEO DFBs using data from the Van Allen Probes reveals that just like trans-GEO DFBs, cis-GEO DFBs occur most often in the premidnight sector, but their occurrence rate is ~1/3 that of trans-GEO DFBs. Half the cis-GEO DFBs are accompanied by an energetic particle injection and have an electric field 3 times stronger than that of the injectionless half. All DFB injections are dispersionless within the temporal resolution considered (11 s). In conclusion, our findings suggest that these injections are ushered or produced locally by the DFB, and the DFB's strong electric field is an important aspect of the injection generation mechanism.

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Research Organization:: Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE; National Aeronautics and Space Administration (NASA); International Space Science Inst. (ISSI), Bern (Switzerland)

Grant/Contract Number:: AC52-06NA25396; NAS5‐02099; NNX14AC17G; NAS5‐01072

OSTI ID:: 1473806

Report Number(s):: LA-UR-17-28133

Journal Information:: Journal of Geophysical Research. Space Physics, Vol. 121, Issue 2; ISSN 2169-9380

Publisher:: American Geophysical UnionCopyright Statement

Country of Publication:: United States

Language:: English

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58 GEOSCIENCES
dipolarizing flux bundle
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geosynchronous orbit
magnetic storm

Title: Dipolarizing flux bundles in the cis-geosynchronous magnetosphere: Relationship between electric fields and energetic particle injections

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