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

Abstract

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 sectormore » 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.« less

Authors:
 [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)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1221606
Report Number(s):
LA-UR-15-23068
Journal ID: ISSN 2169-9380
Grant/Contract Number:  
AC52-06NA25396
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Geophysical Research. Space Physics
Additional Journal Information:
Journal Name: Journal of Geophysical Research. Space Physics; Journal ID: ISSN 2169-9380
Publisher:
American Geophysical Union
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; EMIC waves; Van Allen Probes; Fast Fourier Transform; spatial distribution; band separation

Citation Formats

Saikin, A. A., Zhang, J. -C., Allen, R. C., Smith, C. W., Kistler, L. M., Spence, H. E., Torbert, R. B., Kletzing, C. A., and Jordanova, Vania K.. The occurrence and wave properties of H⁺-, He⁺-, and O⁺-band EMIC waves observed by the Van Allen Probes. United States: N. p., 2015. Web. https://doi.org/10.1002/2015JA021358.
Saikin, A. A., Zhang, J. -C., Allen, R. C., Smith, C. W., Kistler, L. M., Spence, H. E., Torbert, R. B., Kletzing, C. A., & Jordanova, Vania K.. The occurrence and wave properties of H⁺-, He⁺-, and O⁺-band EMIC waves observed by the Van Allen Probes. United States. https://doi.org/10.1002/2015JA021358
Saikin, A. A., Zhang, J. -C., Allen, R. C., Smith, C. W., Kistler, L. M., Spence, H. E., Torbert, R. B., Kletzing, C. A., and Jordanova, Vania K.. Sat . "The occurrence and wave properties of H⁺-, He⁺-, and O⁺-band EMIC waves observed by the Van Allen Probes". United States. https://doi.org/10.1002/2015JA021358. https://www.osti.gov/servlets/purl/1221606.
@article{osti_1221606,
title = {The occurrence and wave properties of H⁺-, He⁺-, and O⁺-band EMIC waves observed by the Van Allen Probes},
author = {Saikin, A. A. and Zhang, J. -C. and Allen, R. C. and Smith, C. W. and Kistler, L. M. and Spence, H. E. and Torbert, R. B. and Kletzing, C. A. and Jordanova, Vania K.},
abstractNote = {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.},
doi = {10.1002/2015JA021358},
journal = {Journal of Geophysical Research. Space Physics},
number = ,
volume = ,
place = {United States},
year = {2015},
month = {9}
}

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    • Geophysical Research Letters, Vol. 46, Issue 12
    • DOI: 10.1029/2019gl083456

    Properties of Localized Precipitation of Energetic Protons Equatorward of the Isotropic Boundary
    journal, October 2019

    • Semenova, N. V.; Yahnin, A. G.; Yahnina, T. A.
    • Geophysical Research Letters, Vol. 46, Issue 20
    • DOI: 10.1029/2019gl085373

    Electron Inertial Effects on Linearly Polarized Electromagnetic Ion Cyclotron Waves at Earth's Magnetosphere
    journal, April 2019

    • Kim, Eun‐Hwa; Johnson, Jay R.; Lee, Dong‐Hun
    • Journal of Geophysical Research: Space Physics
    • DOI: 10.1029/2019ja026532

    Variability of the Proton Radiation Belt
    journal, July 2019

    • Selesnick, R. S.; Albert, J. M.
    • Journal of Geophysical Research: Space Physics, Vol. 124, Issue 7
    • DOI: 10.1029/2019ja026754

    Oxygen Ion Dynamics in the Earth's Ring Current: Van Allen Probes Observations
    journal, October 2019

    • Yue, Chao; Bortnik, Jacob; Li, Wen
    • Journal of Geophysical Research: Space Physics, Vol. 124, Issue 10
    • DOI: 10.1029/2019ja026801

    Analyzing EMIC Waves in the Inner Magnetosphere Using Long‐Term Van Allen Probes Observations
    journal, September 2019

    • Chen, Huayue; Gao, Xinliang; Lu, Quanming
    • Journal of Geophysical Research: Space Physics, Vol. 124, Issue 9
    • DOI: 10.1029/2019ja026965

    Propagation of EMIC Waves Inside the Plasmasphere: A Two‐Event Study
    journal, November 2019

    • Wang, G.; Zhang, T. L.; Gao, Z. L.
    • Journal of Geophysical Research: Space Physics, Vol. 124, Issue 11
    • DOI: 10.1029/2019ja027055

    Scattering of Ultra-relativistic Electrons in the Van Allen Radiation Belts Accounting for Hot Plasma Effects
    journal, December 2017


    Laboratory space physics: Investigating the physics of space plasmas in the laboratory
    journal, May 2018


    On the Contribution of EMIC Waves to the Reconfiguration of the Relativistic Electron Butterfly Pitch Angle Distribution Shape on 2014 September 12—A Case Study
    journal, February 2019

    • Medeiros, Claudia; Souza, V. M.; Vieira, L. E. A.
    • The Astrophysical Journal, Vol. 872, Issue 1
    • DOI: 10.3847/1538-4357/aaf970