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Ion Injection Triggered EMIC Waves in the Earth's Magnetosphere

Journal Article · · Journal of Geophysical Research. Space Physics
DOI:https://doi.org/10.1029/2018JA025354· OSTI ID:1485391
 [1];  [2];  [3];  [4];  [5];  [6];  [7];  [8];  [7]
  1. Indian Inst. of Geomagnetism, Navi, Mumbai (India); NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States); Catholic Univ. of America, Washington DC (United States)
  2. NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States)
  3. Aerospace Corporation, Chantilly (United States). Space Sciences Dept.
  4. NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States); Univ. of Maryland, College Park, MD (United States). Dept. of Astronomy
  5. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  6. National Oceanic and Atmospheric Administration (NOAA), Boulder, CO (United States). Space Weather Prediction Center
  7. Univ. of Minnesota, Minneapolis, MN (United States). School of Physics and Astronomy
  8. NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States); Catholic Univ. of America, Washington DC (United States)
+ Show Author Affiliations
We present Van Allen Probe observations of electromagnetic ion cyclotron (EMIC) waves triggered solely due to individual substorm-injected ions in the absence of storms or compressions of the magnetosphere during 9 August 2015. The time at which the injected ions are observed directly corresponds to the onset of EMIC waves at the location of Van Allen Probe A (L = 5.5 and 18:06 magnetic local time). The injection was also seen at geosynchronous orbit by the Geostationary Operational Environmental Satellite and Los Alamos National Laboratory spacecraft, and the westward(eastward) drift of ions(electrons) was monitored by Los Alamos National Laboratory spacecraft at different local times. The azimuthal location of the injection was determined by tracing the injection signatures backward in time to their origin assuming a dipolar magnetic field of Earth. The center of this injection location was determined to be close to ~20:00 magnetic local time. Geostationary Operational Environmental Satellite and ground magnetometer responses confirm substorm onset at approximately the same local time. The observed EMIC wave onsets at Van Allen Probe were also associated with a magnetic field decrease. The arrival of anisotropic ions along with the decrease in the magnetic field favors the growth of the EMIC wave instability based on linear theory analysis.
Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
National Aeronautics and Space Administration (NASA); USDOE
Grant/Contract Number:
89233218CNA000001
OSTI ID:
1485391
Report Number(s):
LA-UR--18-25089
Journal Information:
Journal of Geophysical Research. Space Physics, Journal Name: Journal of Geophysical Research. Space Physics Journal Issue: 6 Vol. 123; ISSN 2169-9380
Publisher:
American Geophysical UnionCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (6)

Modulation of Electromagnetic Ion Cyclotron Waves by Pc5 ULF Waves and Energetic Ring Current Ions journal March 2019
The Effects of Localized Thermal Pressure on Equilibrium Magnetic Fields and Particle Drifts in The Inner Magnetosphere journal July 2019
Generation of EMIC Waves and Effects on Particle Precipitation During a Solar Wind Pressure Intensification With B z >0 journal June 2019
Multi‐instrument Observations of Mesoscale Enhancement of Subauroral Polarization Stream Associated With an Injection journal March 2019
Precipitation of MeV and Sub‐MeV Electrons Due to Combined Effects of EMIC and ULF Waves journal October 2019
Propagation of EMIC Waves Inside the Plasmasphere: A Two‐Event Study journal November 2019

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Related Subjects

58 GEOSCIENCES
EMIC waves
Heliospheric and Magnetospheric Physics
Van Allen Probes
ion injections
magnetic dip
substorm