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Effect of spatial density variation and O+ concentration on the growth and evolution of electromagnetic ion cyclotron waves

Journal Article · · Journal of Geophysical Research. Space Physics
DOI:https://doi.org/10.1002/2014JA020384· OSTI ID:1193682
 [1];  [2];  [3]
  1. Dartmouth College, Hanover, NH (United States)
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  3. Univ. of Newcastle, New South Wales (Australia)
+ Show Author Affiliations
We simulate electromagnetic ion cyclotron (EMIC) wave growth and evolution within three regions, the plasmasphere (or plasmaspheric plume), the plasmapause, and the low-density plasmatrough outside the plasmapause. First, we use a ring current simulation with a plasmasphere model to model the particle populations that give rise to the instability for conditions observed on 9 June 2001. Then, using two different models for the cold ion composition, we do a full scale hybrid code simulation in dipole coordinates of the EMIC waves on a meridional plane at MLT = 18 and at 1900 UT within a range of L shell from L = 4.9 to 6.7. EMIC waves were observed during June 9, 2001 by Geostationary Operational Environmental Satellite (GOES) spacecraft. While an exact comparison between observed and simulated spectra is not possible here, we do find significant similarities between the two, at least at one location within the region of largest wave growth. We find that the plasmapause is not a preferred region for EMIC wave growth, though waves can grow in that region. The density gradient within the plasmapause does, however, affect the orientation of wave fronts and wave vector both within the plasmapause and in adjacent regions. There is a preference for EMIC waves to be driven in the He+ band (frequencies between the O+ and He+ gyrofrequencies) within the plasmasphere, although they can also grow in the plasmatrough. If present, H+ band waves are more likely to grow in the plasmatrough. This fact, plus L dependence of the frequency and possible time evolution toward lower frequency waves, can be explained by a simple model. Large O+ concentration limits the frequency range of or even totally quenches EMIC waves. This is more likely to occur in the plasmatrough at solar maximum. Such large O+ concentration significantly affects the H+ cutoff frequency and hence the width in frequency of the stop band above the He+ gyrofrequency. EMIC wave surfaces predicted by cold plasma theory are altered by the finite temperature of the ring current H+.
Research Organization:
Los Alamos National Laboratory (LANL)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC52-06NA25396
OSTI ID:
1193682
Report Number(s):
LA-UR-14-25308
Journal Information:
Journal of Geophysical Research. Space Physics, Journal Name: Journal of Geophysical Research. Space Physics Journal Issue: 10 Vol. 119; ISSN 2169-9380
Country of Publication:
United States
Language:
English

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Cited By (11)

Investigation of EMIC wave scattering as the cause for the BARREL 17 January 2013 relativistic electron precipitation event: A quantitative comparison of simulation with observations journal December 2014
Observations of coincident EMIC wave activity and duskside energetic electron precipitation on 18-19 January 2013: EMIC Waves and Electron Precipitation journal July 2015
Van Allen probes, NOAA, GOES, and ground observations of an intense EMIC wave event extending over 12 h in magnetic local time: EMIC WAVES AND THE RADIATION BELTS journal July 2015
Dependence of EMIC wave parameters during quiet, geomagnetic storm, and geomagnetic storm phase times: STORM TIME EMIC WAVES journal July 2016
The relationship between the plasmapause and outer belt electrons journal September 2016
Bounce resonance scattering of radiation belt electrons by H + band EMIC waves journal February 2017
The occurrence and wave properties of EMIC waves observed by the Magnetospheric Multiscale (MMS) mission: EMIC Wave Properties journal August 2017
Investigating Loss of Relativistic Electrons Associated With EMIC Waves at Low L Values on 22 June 2015 journal June 2019
Pitch Angle Scattering of Sub‐MeV Relativistic Electrons by Electromagnetic Ion Cyclotron Waves journal July 2019
Analyzing EMIC Waves in the Inner Magnetosphere Using Long‐Term Van Allen Probes Observations journal September 2019
Heavy ion acceleration by EMIC waves in the near-Earth plasma sheet journal February 2019

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Related Subjects

58 GEOSCIENCES
Heliospheric and Magnetospheric Physics