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Observations of Particle Loss due to Injection‐Associated Electromagnetic Ion Cyclotron Waves
Author(s) -
Kim Hyomin,
Schiller Quintin,
Engebretson Mark J.,
Noh Sungjun,
Kuzichev Ilya,
Lanzerotti Louis J.,
Gerrard Andrew J.,
Kim KhanHyuk,
Lessard Marc R.,
Spence Harlan E.,
Lee DaeYoung,
Matzka Jürgen,
Fromm Tanja
Publication year - 2021
Publication title -
journal of geophysical research: space physics
Language(s) - English
Resource type - Journals
eISSN - 2169-9402
pISSN - 2169-9380
DOI - 10.1029/2020ja028503
Subject(s) - van allen radiation belt , van allen probes , physics , spacecraft , cyclotron , electron , computational physics , particle radiation , electron precipitation , atomic physics , relativistic particle , earth's magnetic field , geophysics , charged particle , magnetic field , ion , magnetosphere , nuclear physics , astronomy , quantum mechanics
We report on observations of electromagnetic ion cyclotron (EMIC) waves and their interactions with injected ring current particles and high energy radiation belt electrons. The magnetic field experiment aboard the twin Van Allen Probes spacecraft measured EMIC waves near L = 5.5–6. Particle data from the spacecraft show that the waves were associated with particle injections. The wave activity was also observed by a ground‐based magnetometer near the spacecraft geomagnetic footprint over a more extensive temporal range. Phase space density profiles, calculated from directional differential electron flux data from Van Allen Probes, show that there was a significant energy‐dependent relativistic electron dropout over a limited L ‐shell range during and after the EMIC wave activity. In addition, the NOAA spacecraft observed relativistic electron precipitation associated with the EMIC waves near the footprint of the Van Allen Probes spacecraft. The observations suggest EMIC wave‐induced relativistic electron loss in the radiation belt.