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Title: Systematic Evaluation of Low-Frequency Hiss and Energetic Electron Injections

Abstract

Here, the excitation of low-frequency (LF) plasmaspheric hiss, over the frequency range from 20 Hz to 100 Hz, is systematically investigated by comparing the hiss wave properties with electron injections at energies from tens of keV to several hundreds of keV. Both particle and wave data from the Van Allen Probes during the period from September 2012 to June 2016 are used in the present study. Our results demonstrate that the intensity of LF hiss has a clear day-night asymmetry, and increases with increasing geomagnetic activity, similar to the behavior of normal hiss (approximately hundred of hertz to several kilohertz). The occurrence rate of LF hiss in association with electron injections is up to 80% in the outer plasmasphere ( L > 4) on the dayside, and the strong correlation extends to lower L shells for more active times. In contrast, at lower L shells ( L < 3.5), LF hiss is seldom associated with electron injections. The LF hiss with Poynting flux directed away from the equator is dominant at higher magnetic latitudes and higher L shells, suggesting a local amplification of LF hiss in the outer plasmasphere. The averaged electron fluxes are larger at higher L shells, wheremore » significant LF hiss wave events are observed. Our study suggests the importance of electron injections and their drift trajectories toward the dayside plasmasphere in locally amplifying the LF hiss waves detected by the Van Allen Probes.« less

Authors:
ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [3]; ORCiD logo [4]; ORCiD logo [4]; ORCiD logo [4]; ORCiD logo [5]; ORCiD logo [6]; ORCiD logo [6]; ORCiD logo [6]
  1. Boston Univ., Boston, MA (United States)
  2. Boston Univ., Boston, MA (United States); Univ. of California, Los Angeles, CA (United States)
  3. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  4. Univ. of Iowa, Iowa City, IA (United States)
  5. Univ. of New Hampshire, Durham, NH (United States)
  6. The Aerospace Corp., El Segundo, CA (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
National Aeronautic and Space Administration (NASA); USDOE
OSTI Identifier:
1417177
Report Number(s):
LA-UR-17-31426
Journal ID: ISSN 2169-9380; TRN: US1801006
Grant/Contract Number:  
AC52-06NA25396
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Geophysical Research. Space Physics
Additional Journal Information:
Journal Volume: 122; Journal Issue: 10; Journal ID: ISSN 2169-9380
Publisher:
American Geophysical Union
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; Heliospheric and Magnetospheric Physics

Citation Formats

Shi, Run, Li, Wen, Ma, Qianli, Reeves, Geoffrey D., Kletzing, C. A., Kurth, W. S., Hospodarsky, G. B., Spence, H. E., Blake, J. B., Fennell, J. F., and Claudepierre, S. G. Systematic Evaluation of Low-Frequency Hiss and Energetic Electron Injections. United States: N. p., 2017. Web. doi:10.1002/2017JA024571.
Shi, Run, Li, Wen, Ma, Qianli, Reeves, Geoffrey D., Kletzing, C. A., Kurth, W. S., Hospodarsky, G. B., Spence, H. E., Blake, J. B., Fennell, J. F., & Claudepierre, S. G. Systematic Evaluation of Low-Frequency Hiss and Energetic Electron Injections. United States. doi:10.1002/2017JA024571.
Shi, Run, Li, Wen, Ma, Qianli, Reeves, Geoffrey D., Kletzing, C. A., Kurth, W. S., Hospodarsky, G. B., Spence, H. E., Blake, J. B., Fennell, J. F., and Claudepierre, S. G. Thu . "Systematic Evaluation of Low-Frequency Hiss and Energetic Electron Injections". United States. doi:10.1002/2017JA024571. https://www.osti.gov/servlets/purl/1417177.
@article{osti_1417177,
title = {Systematic Evaluation of Low-Frequency Hiss and Energetic Electron Injections},
author = {Shi, Run and Li, Wen and Ma, Qianli and Reeves, Geoffrey D. and Kletzing, C. A. and Kurth, W. S. and Hospodarsky, G. B. and Spence, H. E. and Blake, J. B. and Fennell, J. F. and Claudepierre, S. G.},
abstractNote = {Here, the excitation of low-frequency (LF) plasmaspheric hiss, over the frequency range from 20 Hz to 100 Hz, is systematically investigated by comparing the hiss wave properties with electron injections at energies from tens of keV to several hundreds of keV. Both particle and wave data from the Van Allen Probes during the period from September 2012 to June 2016 are used in the present study. Our results demonstrate that the intensity of LF hiss has a clear day-night asymmetry, and increases with increasing geomagnetic activity, similar to the behavior of normal hiss (approximately hundred of hertz to several kilohertz). The occurrence rate of LF hiss in association with electron injections is up to 80% in the outer plasmasphere (L > 4) on the dayside, and the strong correlation extends to lower L shells for more active times. In contrast, at lower L shells (L < 3.5), LF hiss is seldom associated with electron injections. The LF hiss with Poynting flux directed away from the equator is dominant at higher magnetic latitudes and higher L shells, suggesting a local amplification of LF hiss in the outer plasmasphere. The averaged electron fluxes are larger at higher L shells, where significant LF hiss wave events are observed. Our study suggests the importance of electron injections and their drift trajectories toward the dayside plasmasphere in locally amplifying the LF hiss waves detected by the Van Allen Probes.},
doi = {10.1002/2017JA024571},
journal = {Journal of Geophysical Research. Space Physics},
number = 10,
volume = 122,
place = {United States},
year = {2017},
month = {10}
}

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