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First Global Images of Ion Energization in the Terrestrial Foreshock by the Interstellar Boundary Explorer

Journal Article · · Geophysical Research Letters
DOI:https://doi.org/10.1029/2020gl088188· OSTI ID:1764217
 [1];  [2];  [3];  [1];  [2];  [4];  [5];  [6];  [2]
  1. Southwest Research Institute, San Antonio, TX (United States); Univ. of Texas at San Antonio, TX (United States)
  2. Princeton Univ., NJ (United States)
  3. Southwest Research Institute, San Antonio, TX (United States)
  4. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  5. Lockheed Martin Advanced Technology Center, Palo Alto, CA (United States)
  6. Univ. of New Hampshire, Durham, NH (United States)
+ Show Author Affiliations
The Interstellar Boundary Explorer (IBEX) mission provides global energetic neutral atom (ENA) observations from the heliosphere and the Earth's magnetosphere, including spatial, temporal, and energy information. IBEX views the magnetosphere from the sides and almost always perpendicular to noon-midnight plane. We report the first ENA images of the energization process in the Earth's ion foreshock and magnetosheath regions. We show ENA flux and spectral images of the dayside magnetosphere with significant energization of ENA plasma sources (above ~2.7 keV) in the region magnetically connected to the Earth's bow shock (BS) in its quasi-parallel configuration of the interplanetary magnetic field (IMF). We also show that the ion energization increases gradually with decreasing IMF-BS angle, suggesting more efficient suprathermal ion acceleration deeper in the quasi-parallel foreshock.
Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
National Aeronautic and Space Administration (NASA); USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
89233218CNA000001
OSTI ID:
1764217
Report Number(s):
LA-UR--20-24745
Journal Information:
Geophysical Research Letters, Journal Name: Geophysical Research Letters Journal Issue: 16 Vol. 47; ISSN 0094-8276
Publisher:
American Geophysical UnionCopyright Statement
Country of Publication:
United States
Language:
English

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Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
charge‐exchange
energetic neutral atoms
ion acceleration