skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: 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), Los Alamos, NM (United States)
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, Vol. 119, Issue 10; ISSN 2169-9380
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 55 works
Citation information provided by
Web of Science

References (59)

Electromagnetic ion cyclotron waves stimulated by modest magnetospheric compressions journal January 1993
A statistical study of Pc 1-2 magnetic pulsations in the equatorial magnetosphere: 1. Equatorial occurrence distributions journal March 1992
Dispersion surfaces journal February 1985
Ion observations from geosynchronous orbit as a proxy for ion cyclotron wave growth during storm times: PLASMA-BASED PROXY FOR EMIC WAVES AT GEOSYNCHRONOUS ORBIT journal October 2009
Saturation characteristics of electromagnetic ion cyclotron waves: EMIC SATURATION CHARACTERISTICS journal September 2011
Simulation of EMIC wave excitation in a model magnetosphere including structured high-density plumes: EMIC EXCITATION IN PLUMES journal July 2009
Global simulation of EMIC wave excitation during the 21 April 2001 storm from coupled RCM-RAM-HOTRAY modeling: GLOBAL SIMULATION OF EMIC WAVES journal July 2010
The controlling effect of ion temperature on EMIC wave excitation and scattering: HOT PLASMA EFFECT ON EMIC WAVES journal August 2011
Electromagnetic ion cyclotron wave modeling during the geospace environment modeling challenge event journal April 2014
Loss-cone-driven ion cyclotron waves in the magnetosphere journal January 1992
Electromagnetic ion cyclotron waves in the plasma depletion layer journal August 1993
Bounded anisotropy fluid model for ion temperatures journal January 1994
Solar cycle dependence of bulk ion composition at geosynchronous orbit: GEOSYNCHRONOUS ION COMPOSITION journal March 2011
Evolution of mass density and O+ concentration at geostationary orbit during storm and quiet events journal August 2014
EMIC waves growth and guiding in the presence of cold plasma density irregularities: EMIC IN COLD PLASMA IRREGULARITIES journal May 2013
Is the plasmapause a preferred source region of electromagnetic ion cyclotron waves in the magnetosphere? journal July 2001
The relationship between plasma density structure and EMIC waves at geosynchronous orbit book January 2005
Crucial role of ring current H + in electromagnetic ion cyclotron wave dispersion relation: Results from global simulations : DYNAMICS - EMIC WAVE AND RC MODEL journal November 2008
Self-consistent model of magnetospheric electric field, ring current, plasmasphere, and electromagnetic ion cyclotron waves: Initial results: MAGNETOSPHERE-IONOSPHERE MODEL journal March 2009
The ion cyclotron anisotropy instability and the inverse correlation between proton anisotropy and proton beta journal January 1994
Hot proton anisotropies and cool proton temperatures in the outer magnetosphere journal January 1994
Proton and helium cyclotron anisotropy instability thresholds in the magnetosheath journal January 1994
A limited closure relation for anisotropic plasmas from the Earth’s magnetosheath* journal May 1994
Electromagnetic proton cyclotron instability: Interactions with magnetospheric protons journal November 1995
EMIC wave activity during geomagnetic storm and nonstorm periods: CRRES results: EMIC DURING CRRES STORMS journal December 2010
Wave heating of He + by electromagnetic ion cyclotron waves in the magnetosphere: Heating near the H + -He + bi-ion resonance frequency journal June 1997
Two-dimensional hybrid code simulation of electromagnetic ion cyclotron waves in a dipole magnetic field: A 2-D SIMULATION OF EMIC WAVES IN DIPOLE FIELD journal December 2009
Two-dimensional hybrid code simulation of electromagnetic ion cyclotron waves of multi-ion plasmas in a dipole magnetic field: 2-D SIMULATION OF EMIC WAVES IN DIPOLE FIELD journal September 2010
Collisional losses of ring current ions journal January 1996
Modeling ring current proton precipitation by electromagnetic ion cyclotron waves during the May 14-16, 1997, storm journal January 2001
Ground disturbances of the ring, magnetopause, and tail currents on the day the solar wind almost disappeared journal November 2001
Kinetic simulations of ring current evolution during the Geospace Environment Modeling challenge events journal January 2006
Relativistic electron precipitation by EMIC waves from self-consistent global simulations: EMIC WAVES AND RELATIVISTIC ELECTRONS journal March 2008
Modeling ring current ion and electron dynamics and plasma instabilities during a high-speed stream driven storm: RING CURRENT DYNAMICS DURING HSS STORMS journal May 2012
Limit on stably trapped particle fluxes journal January 1966
Reply to comment by R. M. Thorne and R. B. Horne on Khazanov et al. [2002] and Khazanov et al. [2006] : COMMENTARY journal December 2007
On the presence and properties of cold ions near Earth's equatorial magnetosphere: Magnetospheric cold ions journal March 2014
Statistical analysis of relativistic electron energies for cyclotron resonance with EMIC waves observed on CRRES journal January 2003
Review of radiation belt relativistic electron losses journal March 2007
Nonlinear evolution of EMIC waves in a uniform magnetic field: 1. Hybrid simulations: HYBRID SIMULATIONS OF EMIC WAVES journal December 2010
Hybrid simulations of EMIC waves in a dipolar magnetic field: HYBRID SIMULATIONS OF EMIC WAVES journal September 2011
Impact of cold O + ions on the generation and evolution of EMIC waves : EFFECTS OF O journal January 2013
Source and loss rates of radiation belt relativistic electrons during magnetic storms journal January 2006
Simulation of electromagnetic ion cyclotron triggered emissions in the Earth's inner magnetosphere: SIMULATION OF EMIC TRIGGERED EMISSIONS journal May 2011
Electromagnetic ion cyclotron waves in the helium branch induced by multiple electromagnetic ion cyclotron triggered emissions: HELIUM BRANCH EMIC WAVES journal September 2011
Review of modeling of losses and sources of relativistic electrons in the outer radiation belt II: Local acceleration and loss journal November 2008
The link between a detached subauroral proton arc and a plasmaspheric plume journal January 2004
Mass density inferred from toroidal wave frequencies and its comparison to electron density journal January 2006
Ion composition in the plasma trough and plasma plume derived from a Combined Release and Radiation Effects Satellite magnetoseismic study: ION COMPOSITION IN THE PLASMA TROUGH AND PLASMA PLUME journal December 2008
The contribution of ion-cyclotron waves to electron heating and SAR-arc excitation near the storm-time plasmapause journal February 1992
Modulation of electromagnetic ion cyclotron instability due to interaction with ring current O + during magnetic storms journal January 1997
Comment on Khazanov et al. [2002] and Khazanov et al. [2006] : COMMENTARY journal December 2007
Modeling the dynamics of the inner magnetosphere during strong geomagnetic storms journal January 2005
Crossover frequencies in multicomponent plasma journal January 1973
Statistical analysis of EMIC waves in plasmaspheric plumes from Cluster observations: EMIC WAVES IN PLASMASPHERIC PLUMES journal August 2013
Energetic proton precipitation related to ion–cyclotron waves journal October 2007
Energetic particle counterparts for geomagnetic pulsations of Pc1 and IPDP types journal January 2003
Correlations of magnetospheric ion composition with geomagnetic and solar activity journal January 1982
Self-consistent inner magnetosphere simulation driven by a global MHD model: INNER MAGNETOSPHERE MODEL journal December 2010

Cited By (2)

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

Similar Records

A statistical study of EMIC waves observed by Cluster: 2. Associated plasma conditions
Journal Article · Fri Jul 01 00:00:00 EDT 2016 · Journal of Geophysical Research. Space Physics · OSTI ID:1193682
+6 more
A parametric study of the linear growth of magnetospheric EMIC waves in a hot plasma
Journal Article · Wed Jun 15 00:00:00 EDT 2016 · Physics of Plasmas · OSTI ID:1193682
+4 more
Oxygen torus and its coincidence with EMIC wave in the deep inner magnetosphere: Van Allen Probe B and Arase observations
Journal Article · Mon Aug 03 00:00:00 EDT 2020 · Earth, Planets and Space (Online) · OSTI ID:1193682
+22 more

Related Subjects

58 GEOSCIENCES
Heliospheric and Magnetospheric Physics