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Title: A statistical study of EMIC waves observed by Cluster: 2. Associated plasma conditions

Journal Article · · Journal of Geophysical Research. Space Physics
 [1];  [2];  [2];  [2];  [3];  [4];  [5];  [6];  [7]
  1. Univ. of New Hampshire, Durham, NH (United States); Southwest Research Institute, San Antonio, TX (United States); Univ. of Texas at San Antonio, San Antonio, TX (United States)
  2. Univ. of New Hampshire, Durham, NH (United States)
  3. Chinese Academy of Sciences, Beijing (China)
  4. Max-Plank-Institut fur Extraterrestrische Physik, Garching (Germany)
  5. Rutherford Appleton Laboratory, Didcot (United Kingdom)
  6. Swedish Institute of Space Physics (IRF), Uppsala (Sweden)
  7. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

This is the second in a pair of papers discussing a statistical study of electromagnetic ion cyclotron (EMIC) waves detected during 10 years (2001–2010) of Cluster observations. In the first paper, an analysis of EMIC wave properties (i.e., wave power, polarization, normal angle, and wave propagation angle) is presented in both the magnetic latitude (MLAT)-distance as well as magnetic local time (MLT)-L frames. In addition, this paper focuses on the distribution of EMIC wave-associated plasma conditions as well as two EMIC wave generation proxies (the electron plasma frequency to gyrofrequency ratio proxy and the linear theory proxy) in these same frames. Based on the distributions of hot H+ anisotropy, electron and hot H+ density measurements, hot H+ parallel plasma beta, and the calculated wave generation proxies, three source regions of EMIC waves appear to exist: (1) the well-known overlap between cold plasmaspheric or plume populations with hot anisotropic ring current populations in the postnoon to dusk MLT region; (2) regions all along the dayside magnetosphere at high L shells related to dayside magnetospheric compression and drift shell splitting; and (3) off-equator regions possibly associated with the Shabansky orbits in the dayside magnetosphere.

Research Organization:
Los Alamos National Laboratory (LANL)
Sponsoring Organization:
NASA; USDOE
Grant/Contract Number:
AC52-06NA25396
OSTI ID:
1291230
Report Number(s):
LA-UR-16-21147
Journal Information:
Journal of Geophysical Research. Space Physics, Journal Name: Journal of Geophysical Research. Space Physics; ISSN 2169-9380
Publisher:
American Geophysical UnionCopyright Statement
Country of Publication:
United States
Language:
English

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  • MacDonald, Elizabeth A.; Blum, Lauren W.; Gary, S. Peter
  • Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences, Vol. 466, Issue 2123 https://doi.org/10.1098/rspa.2010.0076
journal May 2010
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Cited By (10)

The occurrence and wave properties of EMIC waves observed by the Magnetospheric Multiscale (MMS) mission: EMIC Wave Properties journal August 2017
A New N + Band of Electromagnetic Ion Cyclotron Waves in Multi‐Ion Cold Plasmas journal October 2018
Plasmaspheric Plumes and EMIC Rising Tone Emissions journal November 2018
Energetic Electron Precipitation: Multievent Analysis of Its Spatial Extent During EMIC Wave Activity journal April 2019
Storm Time EMIC Waves Observed by Swarm and Van Allen Probe Satellites journal January 2019
EMIC Waves in the Outer Magnetosphere: Observations of an Off‐Equator Source Region journal June 2019
Magnetospheric Multiscale Observation of Quasiperiodic EMIC Waves Associated With Enhanced Solar Wind Pressure journal July 2019
Direct Observation of Subrelativistic Electron Precipitation Potentially Driven by EMIC Waves journal November 2019
MMS Measurements and Modeling of Peculiar Electromagnetic Ion Cyclotron Waves journal November 2019
Direct measurements of two-way wave-particle energy transfer in a collisionless space plasma journal September 2018

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