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Title: Storm time impulsive enhancements of energetic oxygen due to adiabatic acceleration of preexisting warm oxygen in the inner magnetosphere: Storm Time Impulsive Oxygen Enhancements

Journal Article · · Journal of Geophysical Research. Space Physics
DOI:https://doi.org/10.1002/2016JA022384· OSTI ID:1495135
 [1];  [2]; ORCiD logo [3];  [1];  [1];  [4];  [5];  [5];  [6];  [7]; ORCiD logo [8]
  1. Nagoya Univ. (Japan). Inst. for Space-Earth Environmental Research
  2. Univ. of Tokyo (Japan). Dept. of Earth and Planetary Science, Graduate School of Science
  3. Kyoto Univ. (Japan). World Data Center for Geomagnetis
  4. New Jersey Inst. of Technology, Newark, NJ (United States)
  5. Johns Hopkins Univ., Baltimore, MD (United States). Applied Physics Lab.
  6. Aerospace Corporation, El Segundo, CA (United States)
  7. Univ. of New Hampshire, Durham, NH (United States). Inst. for the Study of Earth, Oceans, and Space
  8. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
+ Show Author Affiliations

We examine enhancements of energetic (>50 keV) oxygen ions observed by the Radiation Belt Storm Probes Ion Composition Experiment (RBSPICE) instrument on board the Van Allen Probes spacecraft in the inner magnetosphere (L ~ 6) at 22–23 h magnetic local time (MLT) during an injection event of the 6 June 2013 storm. Simultaneous observations by two Van Allen Probes spacecraft located close together (~0.5 RE) indicate that particle injections occurred in the premidnight sector (< ~24 h MLT). We also examine the evolution of the proton and oxygen energy spectra at L ~ 6 during the injection event. The spectral slope did not significantly change during the storm. The oxygen phase space density (PSD) was shifted toward higher PSD in a wide range of the first adiabatic invariant. The spectral evolution manifests the characteristics of adiabatic acceleration and density increase of oxygen ions. Warm (0.1–10 keV) oxygen measured by the Helium, Oxygen, Proton, and Electron (HOPE) instrument was enhanced prior to the storm mostly in magnetic field-aligned directions. Finally, the most reasonable scenario of this event is that warm oxygen ions that preexisted in the inner magnetosphere were picked up and adiabatically transported and accelerated by spatially localized, temporarily impulsive electric fields.

Research Organization:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
National Aeronautics and Space Administration (NASA); USDOE
Grant/Contract Number:
89233218CNA000001; NAS5-01072; 921647
OSTI ID:
1495135
Report Number(s):
LA-UR-15-28291
Journal Information:
Journal of Geophysical Research. Space Physics, Vol. 121, Issue 8; ISSN 2169-9380
Publisher:
American Geophysical UnionCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 12 works
Citation information provided by
Web of Science

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Cited By (2)

Contribution of energetic and heavy ions to the plasma pressure: The 27 September to 3 October 2002 storm: PLASMA PRESSURE DURING MAGNETIC STORM journal September 2017
Ion Energies Dominating Energy Density in the Inner Magnetosphere: Spatial Distributions and Composition, Observed by Arase/MEP‐i journal November 2018

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