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Location of intense electromagnetic ion cyclotron (EMIC) wave events relative to the plasmapause: Van Allen Probes observations

Journal Article · · Journal of Geophysical Research. Space Physics
DOI:https://doi.org/10.1002/2016JA023392· OSTI ID:1402621
 [1];  [2];  [2];  [2];  [3];  [4];  [5];  [5];  [6];  [7];  [8]
  1. Augsburg College, Minneapolis, MN (United States). Dept. of Physics; Univ. of Iowa, Iowa City, IA (United States). Dept. of Physics and Astronomy
  2. Augsburg College, Minneapolis, MN (United States). Dept. of Physics
  3. Univ. of New Hampshire, Durham, NH (United States). Space Science Center
  4. Dartmouth College, Hanover, NH (United States). Dept. of Physics and Astronomy
  5. Univ. of Minnesota, Minneapolis, MN (United States). School of Physics and Astronomy
  6. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  7. NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States)
  8. The Aerospace Corporation, Los Angeles, CA (United States)
+ Show Author Affiliations
In this paper, we have studied the spatial location relative to the plasmapause (PP) of the most intense electromagnetic ion cyclotron (EMIC) waves observed on Van Allen Probes A and B during their first full precession in local time. Most of these waves occurred over an L range of from -1 to +2 RE relative to the PP. Very few events occurred only within 0.1 RE of the PP, and events with a width in L of < 0.2 RE occurred both inside and outside the PP. Wave occurrence was always associated with high densities of ring current ions; plasma density gradients or enhancements were associated with some events but were not dominant factors in determining the sites of wave generation. Storm main and recovery phase events in the dusk sector were often inside the PP, and dayside events during quiet times and compressions of the magnetosphere were more evenly distributed both inside and outside the PP. Superposed epoch analyses of the dependence of wave onset on solar wind dynamic pressure (Psw), the SME (SuperMAG auroral electrojet) index, and the SYM-H index showed that substorm injections and solar wind compressions were temporally closely associated with EMIC wave onset but to an extent that varied with frequency band, magnetic local time, and storm phase, and location relative to the PP. Finally, the fact that increases in SME and Psw were less strongly correlated with events at the PP than with other events might suggest that the occurrence of those events was affected by the density gradient.
Research Organization:
Augsburg College, Minneapolis, MN (United States); Los Alamos National Lab. (LANL), Los Alamos, NM (United States); NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States)
Sponsoring Organization:
National Aeronautics and Space Administration (NASA) (United States); National Science Foundation (NSF) (United States); USDOE
Grant/Contract Number:
AC52-06NA25396
OSTI ID:
1402621
Report Number(s):
LA-UR--17-20105
Journal Information:
Journal of Geophysical Research. Space Physics, Journal Name: Journal of Geophysical Research. Space Physics Journal Issue: 4 Vol. 122; ISSN 2169-9380
Publisher:
American Geophysical UnionCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (10)

Modulation of Electromagnetic Ion Cyclotron Waves by Pc5 ULF Waves and Energetic Ring Current Ions journal March 2019
Understanding the Driver of Energetic Electron Precipitation Using Coordinated Multisatellite Measurements journal July 2018
Large‐Scale Ducting of Pc1 Pulsations Observed by Swarm Satellites and Multiple Ground Networks journal December 2018
On the Initial Enhancement of Energetic Electrons and the Innermost Plasmapause Locations: Coronal Mass Ejection‐Driven Storm Periods journal November 2018
EMIC Wave Properties Associated With and Without Injections in The Inner Magnetosphere journal March 2019
Pitch Angle Scattering of Sub‐MeV Relativistic Electrons by Electromagnetic Ion Cyclotron Waves journal July 2019
EMIC Waves in the Outer Magnetosphere: Observations of an Off‐Equator Source Region journal June 2019
Properties of Localized Precipitation of Energetic Protons Equatorward of the Isotropic Boundary journal October 2019
Generation of EMIC Waves and Effects on Particle Precipitation During a Solar Wind Pressure Intensification With B z >0 journal June 2019
Propagation of EMIC Waves Inside the Plasmasphere: A Two‐Event Study journal November 2019

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Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
EMIC waves
magnetosphere
plasmapause
plasmasphere
ring current