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The occurrence and wave properties of H⁺-, He⁺-, and O⁺-band EMIC waves observed by the Van Allen Probes

Journal Article · · Journal of Geophysical Research. Space Physics
DOI:https://doi.org/10.1002/2015JA021358· OSTI ID:1221606
 [1];  [1];  [2];  [1];  [1];  [1];  [1];  [3];  [4]
  1. Univ. of New Hampshire, Durham, NH (United States)
  2. Univ. of Texas at San Antonio, TX (United States); Southwest Research Institute, San Antonio, TX (United States)
  3. Univ. of Iowa, Iowa City, IA (United States)
  4. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
We perform a statistical study of electromagnetic ion cyclotron (EMIC) waves detected by the Van Allen Probes mission to investigate the spatial distribution of their occurrence, wave power, ellipticity, and normal angle. The Van Allen Probes have been used which allow us to explore the inner magnetosphere (1.1 to 5.8 RE). Magnetic field measurements from the Electric and Magnetic Field Instrument Suite and Integrated Science on board the Van Allen Probes are used to identify EMIC wave events for the first 22 months of the mission operation (8 September 2012 to 30 June 2014). EMIC waves are examined in H⁺-, He⁺-, and O⁺-bands. Over 700 EMIC wave events have been identified over the three different wave bands (265 H⁺-band events, 438 He⁺-band events, and 68 O⁺-band events). EMIC wave events are observed between L = 2 – 8, with over 140 EMIC wave events observed below L = 4. The results show that H⁺-band EMIC waves have two peak magnetic local time (MLT) occurrence regions: pre-noon (09:00 < MLT ≤ 12:00) and afternoon (15:00 < MLT ≤ 17:00) sectors. He⁺-band EMIC waves feature an overall stronger dayside occurrence. O⁺-band EMIC waves have one peak region located in the morning sector at lower L shells (L < 4). He⁺-band EMIC waves average the highest wave power overall (>0.1 nT²/Hz), especially in the afternoon sector. Ellipticity observations reveal that linearly polarized EMIC waves dominate in lower L shells.
Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC52-06NA25396
OSTI ID:
1221606
Report Number(s):
LA-UR--15-23068
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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Cited By (39)

High-resolution in situ observations of electron precipitation-causing EMIC waves: EMIC WAVES DRIVING PRECIPITATION journal November 2015
Equatorial electron loss by double resonance with oblique and parallel intense chorus waves: EQUATORIAL ELECTRON LOSS journal May 2016
Statistical distribution of EMIC wave spectra: Observations from Van Allen Probes: STATISTICS ON EMIC WAVE SPECTRA journal December 2016
Evidence of sub‐MeV EMIC‐driven electron precipitation journal February 2017
EMIC wave scale size in the inner magnetosphere: Observations from the dual Van Allen Probes journal February 2017
The dependence on geomagnetic conditions and solar wind dynamic pressure of the spatial distributions of EMIC waves observed by the Van Allen Probes: RBSP EMIC WAVES journal May 2016
Dependence of EMIC wave parameters during quiet, geomagnetic storm, and geomagnetic storm phase times: STORM TIME EMIC WAVES journal July 2016
Nonlinear fundamental and harmonic cyclotron resonant scattering of radiation belt ultrarelativistic electrons by oblique monochromatic EMIC waves journal February 2017
Contemporaneous EMIC and whistler mode waves: Observations and consequences for MeV electron loss: SIMULTANEOUS EMIC AND WHISTLER OBSERVATIONS journal August 2017
The occurrence and wave properties of EMIC waves observed by the Magnetospheric Multiscale (MMS) mission: EMIC Wave Properties journal August 2017
Understanding the Mechanisms of Radiation Belt Dropouts Observed by Van Allen Probes journal October 2017
Excitation of O + Band EMIC Waves Through H + Ring Velocity Distributions: Van Allen Probe Observations journal February 2018
Understanding the Driver of Energetic Electron Precipitation Using Coordinated Multisatellite Measurements journal July 2018
A Statistical Survey of Radiation Belt Dropouts Observed by Van Allen Probes journal August 2018
A New N + Band of Electromagnetic Ion Cyclotron Waves in Multi‐Ion Cold Plasmas journal October 2018
Large‐Scale Ducting of Pc1 Pulsations Observed by Swarm Satellites and Multiple Ground Networks journal December 2018
Plasmaspheric Plumes and EMIC Rising Tone Emissions journal November 2018
A Statistical Study of EMIC Waves Associated With and Without Energetic Particle Injection From the Magnetotail journal January 2019
EMIC Wave Properties Associated With and Without Injections in The Inner Magnetosphere journal March 2019
Recent Advancements and Remaining Challenges Associated With Inner Magnetosphere Cross‐Energy/Population Interactions (IMCEPI) journal February 2019
Storm Time EMIC Waves Observed by Swarm and Van Allen Probe Satellites journal January 2019
Pitch Angle Scattering of Sub‐MeV Relativistic Electrons by Electromagnetic Ion Cyclotron Waves journal July 2019
EMIC Wave‐Driven Bounce Resonance Scattering of Energetic Electrons in the Inner Magnetosphere journal April 2019
EMIC Waves in the Outer Magnetosphere: Observations of an Off‐Equator Source Region journal June 2019
Multi‐instrument Observation of Nonlinear EMIC‐Driven Electron Precipitation at sub–MeV Energies journal July 2019
The Relationship Between EMIC Wave Properties and Proton Distributions Based on Van Allen Probes Observations journal April 2019
Wavenumber Analysis of EMIC Waves journal June 2019
Magnetospheric Multiscale Observation of Quasiperiodic EMIC Waves Associated With Enhanced Solar Wind Pressure journal July 2019
Effect of Hot He + Ions on the Electron Pitch Angle Scattering Driven by H + , He + , and O + Band EMIC Waves journal June 2019
Properties of Localized Precipitation of Energetic Protons Equatorward of the Isotropic Boundary journal October 2019
Electron Inertial Effects on Linearly Polarized Electromagnetic Ion Cyclotron Waves at Earth's Magnetosphere journal April 2019
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