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Title: Van Allen Probes observation and modeling of chorus excitation and propagation during weak geomagnetic activities

Abstract

We report correlated data on nightside chorus waves and energetic electrons during two small storm periods: 1 November 2012 (Dst ≈ –45) and 14 January 2013 (Dst ≈ –18). The Van Allen Probes simultaneously observed strong chorus waves at locations L = 5.8 – 6.3, with a lower frequency band 0.1–0.5fce and a peak spectral density ~10–4 nT2/Hz. In the same period, the fluxes and anisotropy of energetic (~10–300 keV) electrons were greatly enhanced in the interval of large negative interplanetary magnetic field Bz. Using a bi-Maxwellian distribution to model the observed electron distribution, we perform ray tracing simulations to show that nightside chorus waves are indeed produced by the observed electron distribution with a peak growth for a field-aligned propagation approximately between 0.3fce and 0.4fce, at latitude <7°. Moreover, chorus waves launched with initial normal angles either θ < 90° or > 90° propagate along the field either northward or southward and then bounce back either away from Earth for a lower frequency or toward Earth for higher frequencies. The current results indicate that nightside chorus waves can be excited even during weak geomagnetic activities in cases of continuous injection associated with negative Bz. Furthermore, we examine a daysidemore » event during a small storm C on 8 May 2014 (Dst ≈ –45) and find that the observed anisotropic energetic electron distributions potentially contribute to the generation of dayside chorus waves, but this requires more thorough studies in the future.« less

Authors:
 [1];  [1];  [1];  [1];  [1];  [2];  [3];  [3];  [3];  [4]; ORCiD logo [5];  [5];  [6]
  1. Changsha Univ. of Science and Technology, Changsha (China)
  2. Univ. of Colorado, Boulder, CO (United States)
  3. Univ. of Iowa, Iowa City, IA (United States)
  4. Univ. of New Hampshire, Durham, NH (United States)
  5. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  6. Aerospace Corporation, Los Angeles, CA (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1236789
Report Number(s):
LA-UR-15-27790
Journal ID: ISSN 2169-9380
Grant/Contract Number:  
41404130; 41274165; 41204114; 921647; 967399; NAS5-01072; AC52-06NA25396
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Geophysical Research. Space Physics
Additional Journal Information:
Journal Volume: 120; Journal Issue: 8; Journal ID: ISSN 2169-9380
Publisher:
American Geophysical Union
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES

Citation Formats

He, Yihua, Xiao, Fuliang, Zhou, Qinghua, Yang, Chang, Liu, Si, Baker, D. N., Kletzing, C. A., Kurth, W. S., Hospodarsky, G. B., Spence, H. E., Reeves, G. D., Funsten, H. O., and Blake, J. B. Van Allen Probes observation and modeling of chorus excitation and propagation during weak geomagnetic activities. United States: N. p., 2015. Web. https://doi.org/10.1002/2015JA021376.
He, Yihua, Xiao, Fuliang, Zhou, Qinghua, Yang, Chang, Liu, Si, Baker, D. N., Kletzing, C. A., Kurth, W. S., Hospodarsky, G. B., Spence, H. E., Reeves, G. D., Funsten, H. O., & Blake, J. B. Van Allen Probes observation and modeling of chorus excitation and propagation during weak geomagnetic activities. United States. https://doi.org/10.1002/2015JA021376
He, Yihua, Xiao, Fuliang, Zhou, Qinghua, Yang, Chang, Liu, Si, Baker, D. N., Kletzing, C. A., Kurth, W. S., Hospodarsky, G. B., Spence, H. E., Reeves, G. D., Funsten, H. O., and Blake, J. B. Thu . "Van Allen Probes observation and modeling of chorus excitation and propagation during weak geomagnetic activities". United States. https://doi.org/10.1002/2015JA021376. https://www.osti.gov/servlets/purl/1236789.
@article{osti_1236789,
title = {Van Allen Probes observation and modeling of chorus excitation and propagation during weak geomagnetic activities},
author = {He, Yihua and Xiao, Fuliang and Zhou, Qinghua and Yang, Chang and Liu, Si and Baker, D. N. and Kletzing, C. A. and Kurth, W. S. and Hospodarsky, G. B. and Spence, H. E. and Reeves, G. D. and Funsten, H. O. and Blake, J. B.},
abstractNote = {We report correlated data on nightside chorus waves and energetic electrons during two small storm periods: 1 November 2012 (Dst ≈ –45) and 14 January 2013 (Dst ≈ –18). The Van Allen Probes simultaneously observed strong chorus waves at locations L = 5.8 – 6.3, with a lower frequency band 0.1–0.5fce and a peak spectral density ~10–4 nT2/Hz. In the same period, the fluxes and anisotropy of energetic (~10–300 keV) electrons were greatly enhanced in the interval of large negative interplanetary magnetic field Bz. Using a bi-Maxwellian distribution to model the observed electron distribution, we perform ray tracing simulations to show that nightside chorus waves are indeed produced by the observed electron distribution with a peak growth for a field-aligned propagation approximately between 0.3fce and 0.4fce, at latitude <7°. Moreover, chorus waves launched with initial normal angles either θ < 90° or > 90° propagate along the field either northward or southward and then bounce back either away from Earth for a lower frequency or toward Earth for higher frequencies. The current results indicate that nightside chorus waves can be excited even during weak geomagnetic activities in cases of continuous injection associated with negative Bz. Furthermore, we examine a dayside event during a small storm C on 8 May 2014 (Dst ≈ –45) and find that the observed anisotropic energetic electron distributions potentially contribute to the generation of dayside chorus waves, but this requires more thorough studies in the future.},
doi = {10.1002/2015JA021376},
journal = {Journal of Geophysical Research. Space Physics},
number = 8,
volume = 120,
place = {United States},
year = {2015},
month = {8}
}

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