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Multipoint Observations of Quasiperiodic Emission Intensification and Effects on Energetic Electron Precipitation

Journal Article · · Journal of Geophysical Research. Space Physics
DOI:https://doi.org/10.1029/2020ja028484· OSTI ID:1832374
 [1];  [1];  [2];  [3];  [3];  [3];  [1];  [4];  [5];  [5];  [6];  [6];  [6];  [7];  [7];  [8];  [9];  [4]
  1. Univ. of California, Los Angeles, CA (United States)
  2. Univ. of California, Los Angeles, CA (United States); Boston Univ., MA (United States)
  3. Boston Univ., MA (United States)
  4. Univ. of Colorado, Boulder, CO (United States)
  5. Univ. of Minnesota, Minneapolis, MN (United States)
  6. Univ. of Iowa, Iowa City, IA (United States)
  7. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  8. The Aerospace Corporation, El Segundo, CA (United States)
  9. Univ. of New Hampshire, Durham, NH (United States)
+ Show Author Affiliations
The two Van Allen Probes simultaneously recorded a coherently modulated quasiperiodic (QP) emission that persisted for 3 h. The magnetic field pulsation at the locations of the two satellites showed a substantial difference, and their frequencies were close to but did not exactly match the repetition frequency of QP emissions for most of the time, suggesting that those coherent QP emissions probably originated from a common source, which then propagated over a broad area in the magnetosphere. The QP emissions were amplified by local anisotropic electron distributions, and their large-scale amplitudes were modulated by the plasma density. A novel observation of this event is that chorus waves at frequencies above QP emissions exhibit a strong correlation with QP emissions. Those chorus waves intensified when the QP emissions reach their peak frequency. This indicates that embryonic QP emissions may be critical for its own intensification as well as chorus waves under certain circumstances. A Low-Earth-Orbit POES satellite observed enhanced energetic electron precipitation in conjunction with the Van Allen Probes, providing direct evidence that QP emissions precipitate energetic electrons into the atmosphere. Finally, this scenario is quantitatively confirmed by our quasilinear diffusion simulation results.
Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
JHU/APL; National Aeronautics and Space Administration (NASA); National Science Foundation (NSF); USDOE
Grant/Contract Number:
89233218CNA000001; SC0010578
OSTI ID:
1832374
Alternate ID(s):
OSTI ID: 1780105
Report Number(s):
LA-UR--20-28811
Journal Information:
Journal of Geophysical Research. Space Physics, Journal Name: Journal of Geophysical Research. Space Physics Journal Issue: 2 Vol. 126; ISSN 2169-9380
Publisher:
American Geophysical UnionCopyright Statement
Country of Publication:
United States
Language:
English

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Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
ULF wave
Van Allen Probes
chorus waves
electron precipitation
heliospheric and magnetospheric physics
quasiperiodic emissions
radiation belt