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Title: Low-energy (< 200 eV) electron acceleration by ULF waves in the plasmaspheric boundary layer: Van Allen Probes observation

Here, we report observational evidence of cold plamsmaspheric electron (< 200 eV) acceleration by ultra-low-frequency (ULF) waves in the plasmaspheric boundary layer on 10 September 2015. Strongly enhanced cold electron fluxes in the energy spectrogram were observed along with second harmonic mode waves with a period of about 1 minute which lasted several hours during two consecutive Van Allen Probe B orbits. Cold electron (<200 eV) and energetic proton (10-20 keV) bi-directional pitch angle signatures observed during the event are suggestive of the drift-bounce resonance mechanism. The correlation between enhanced energy fluxes and ULF waves leads to the conclusions that plasmaspheric dynamics is strongly affected by ULF waves. Van Allen Probe A and B, GOES 13, GOES 15 and MMS 1 observations suggest ULF waves in the event were strongest on the dusk-side magnetosphere. Measurements from MMS 1 contain no evidence of an external wave source during the period when ULF waves and injected energetic protons with a bump-on-tail distribution were detected by Van Allen Probe B. This suggests that the observed ULF waves were probably excited by a localized drift-bounce resonant instability, with the free energy supplied by substorm-injected energetic protons. The observations by Van Allen Probe B suggestmore » that energy transfer between particle species in different energy ranges can take place through the action of ULF waves, demonstrating the important role of these waves in the dynamical processes of the inner magnetosphere.« less
Authors:
ORCiD logo [1] ; ORCiD logo [2] ; ORCiD logo [3] ; ORCiD logo [2] ;  [2] ; ORCiD logo [4] ; ORCiD logo [5] ; ORCiD logo [6] ; ORCiD logo [7] ; ORCiD logo [8] ; ORCiD logo [9]
  1. Peking Univ., Beijing (China); Nagoya Univ., Nagoya (Japan)
  2. Peking Univ., Beijing (China)
  3. Nagoya Univ., Nagoya (Japan)
  4. Univ. of Alberta, Edmonton, AB (Canada)
  5. UCLA, Los Angeles, CA (United State); Univ. Corp. for Atmospheric Research, Boulder, CO (United States)
  6. Univ. of New Hampshire, Durham, NH (United States)
  7. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  8. Univ. of Minnesota, Minneapolis, MN (United States)
  9. Univ. of Iowa, Iowa City, IA (United States)
Publication Date:
Report Number(s):
LA-UR-17-27492
Journal ID: ISSN 2169-9380
Grant/Contract Number:
AC52-06NA25396; 2012CB825603; 41627805
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
Research Org:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org:
National Aeronautic and Space Administration (NASA); USDOE; National Natural Science Foundation of China (NNSFC)
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; Heliospheric and Magnetospheric Physics
OSTI Identifier:
1394991

Ren, Jie, Zong, Q. G., Miyoshi, Y., Zhou, X. Z., Wang, Y. F., Rankin, R., Yue, C., Spence, H. E., Funsten, Herbert O., Wygant, J. R., and Kletzing, C. A.. Low-energy (< 200 eV) electron acceleration by ULF waves in the plasmaspheric boundary layer: Van Allen Probes observation. United States: N. p., Web. doi:10.1002/2017JA024316.
Ren, Jie, Zong, Q. G., Miyoshi, Y., Zhou, X. Z., Wang, Y. F., Rankin, R., Yue, C., Spence, H. E., Funsten, Herbert O., Wygant, J. R., & Kletzing, C. A.. Low-energy (< 200 eV) electron acceleration by ULF waves in the plasmaspheric boundary layer: Van Allen Probes observation. United States. doi:10.1002/2017JA024316.
Ren, Jie, Zong, Q. G., Miyoshi, Y., Zhou, X. Z., Wang, Y. F., Rankin, R., Yue, C., Spence, H. E., Funsten, Herbert O., Wygant, J. R., and Kletzing, C. A.. 2017. "Low-energy (< 200 eV) electron acceleration by ULF waves in the plasmaspheric boundary layer: Van Allen Probes observation". United States. doi:10.1002/2017JA024316. https://www.osti.gov/servlets/purl/1394991.
@article{osti_1394991,
title = {Low-energy (< 200 eV) electron acceleration by ULF waves in the plasmaspheric boundary layer: Van Allen Probes observation},
author = {Ren, Jie and Zong, Q. G. and Miyoshi, Y. and Zhou, X. Z. and Wang, Y. F. and Rankin, R. and Yue, C. and Spence, H. E. and Funsten, Herbert O. and Wygant, J. R. and Kletzing, C. A.},
abstractNote = {Here, we report observational evidence of cold plamsmaspheric electron (< 200 eV) acceleration by ultra-low-frequency (ULF) waves in the plasmaspheric boundary layer on 10 September 2015. Strongly enhanced cold electron fluxes in the energy spectrogram were observed along with second harmonic mode waves with a period of about 1 minute which lasted several hours during two consecutive Van Allen Probe B orbits. Cold electron (<200 eV) and energetic proton (10-20 keV) bi-directional pitch angle signatures observed during the event are suggestive of the drift-bounce resonance mechanism. The correlation between enhanced energy fluxes and ULF waves leads to the conclusions that plasmaspheric dynamics is strongly affected by ULF waves. Van Allen Probe A and B, GOES 13, GOES 15 and MMS 1 observations suggest ULF waves in the event were strongest on the dusk-side magnetosphere. Measurements from MMS 1 contain no evidence of an external wave source during the period when ULF waves and injected energetic protons with a bump-on-tail distribution were detected by Van Allen Probe B. This suggests that the observed ULF waves were probably excited by a localized drift-bounce resonant instability, with the free energy supplied by substorm-injected energetic protons. The observations by Van Allen Probe B suggest that energy transfer between particle species in different energy ranges can take place through the action of ULF waves, demonstrating the important role of these waves in the dynamical processes of the inner magnetosphere.},
doi = {10.1002/2017JA024316},
journal = {Journal of Geophysical Research. Space Physics},
number = 10,
volume = 122,
place = {United States},
year = {2017},
month = {8}
}