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Title: Understanding the Driver of Energetic Electron Precipitation Using Coordinated Multisatellite Measurements

Abstract

Magnetospheric plasma waves play a significant role in ring current and radiation belt dynamics, leading to pitch angle scattering loss and/or stochastic acceleration of the particles. During a nonstormtime dropout event on 24 September 2013, intense electromagnetic ion cyclotron (EMIC) waves were detected by Van Allen Probe A (RBSP-A). We quantitatively analyze a conjunction event when RBSP-A was located approximately along the same magnetic field line as MetOp- 01, which detected simultaneous precipitation of >30 keV protons and energetic electrons over an unexpectedly broad energy range (>~30 keV). Multi-point observations together with quasilinear theory provide direct evidence that the observed electron precipitation at higher energy (>~700 keV) is primarily driven by EMIC waves. However, the newly observed feature of the simultaneous electron precipitation extending down to ~30 keV is not supported by existing theories and raises an interesting question on whether EMIC waves can scatter such low-energy electrons.

Authors:
ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [3]; ORCiD logo [4]; ORCiD logo [4]; ORCiD logo [5]; ORCiD logo [5]; ORCiD logo [5]; ORCiD logo [6]; ORCiD logo [7]; ORCiD logo [8]
+ Show Author Affiliations
  1. Boston Univ., MA (United States)
  2. Boston Univ., MA (United States); Univ. of California, Los Angeles, CA (United States)
  3. Univ. of California, Los Angeles, CA (United States)
  4. National Oceanic and Atmospheric Administration (NOAA), Boulder, CO (United States)
  5. Univ. of Iowa, Iowa City, IA (United States)
  6. Augsburg Univ., Minneapolis, MN (United States)
  7. Univ. of New Hampshire, Durham, NH (United States)
  8. 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.:
National Aeronautics and Space Administration (NASA); USDOE
OSTI Identifier:
1501814
Report Number(s):
LA-UR-18-28974
Journal ID: ISSN 0094-8276
Grant/Contract Number:  
89233218CNA000001
Resource Type:
Accepted Manuscript
Journal Name:
Geophysical Research Letters
Additional Journal Information:
Journal Volume: 45; Journal Issue: 14; Journal ID: ISSN 0094-8276
Publisher:
American Geophysical Union
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; Heliospheric and Magnetospheric Physics

Citation Formats

Capannolo, L., Li, W., Ma, Q., Zhang, X. -J., Redmon, R. J., Rodriguez, J. V., Kletzing, C. A., Kurth, W. S., Hospodarsky, G. B., Engebretson, M. J., Spence, H. E., and Reeves, G. D. Understanding the Driver of Energetic Electron Precipitation Using Coordinated Multisatellite Measurements. United States: N. p., 2018. Web. doi:10.1029/2018GL078604.
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Capannolo, L., Li, W., Ma, Q., Zhang, X. -J., Redmon, R. J., Rodriguez, J. V., Kletzing, C. A., Kurth, W. S., Hospodarsky, G. B., Engebretson, M. J., Spence, H. E., & Reeves, G. D. Understanding the Driver of Energetic Electron Precipitation Using Coordinated Multisatellite Measurements. United States. https://doi.org/10.1029/2018GL078604
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Capannolo, L., Li, W., Ma, Q., Zhang, X. -J., Redmon, R. J., Rodriguez, J. V., Kletzing, C. A., Kurth, W. S., Hospodarsky, G. B., Engebretson, M. J., Spence, H. E., and Reeves, G. D. Thu . "Understanding the Driver of Energetic Electron Precipitation Using Coordinated Multisatellite Measurements". United States. https://doi.org/10.1029/2018GL078604. https://www.osti.gov/servlets/purl/1501814.
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@article{osti_1501814,
title = {Understanding the Driver of Energetic Electron Precipitation Using Coordinated Multisatellite Measurements},
author = {Capannolo, L. and Li, W. and Ma, Q. and Zhang, X. -J. and Redmon, R. J. and Rodriguez, J. V. and Kletzing, C. A. and Kurth, W. S. and Hospodarsky, G. B. and Engebretson, M. J. and Spence, H. E. and Reeves, G. D.},
abstractNote = {Magnetospheric plasma waves play a significant role in ring current and radiation belt dynamics, leading to pitch angle scattering loss and/or stochastic acceleration of the particles. During a nonstormtime dropout event on 24 September 2013, intense electromagnetic ion cyclotron (EMIC) waves were detected by Van Allen Probe A (RBSP-A). We quantitatively analyze a conjunction event when RBSP-A was located approximately along the same magnetic field line as MetOp- 01, which detected simultaneous precipitation of >30 keV protons and energetic electrons over an unexpectedly broad energy range (>~30 keV). Multi-point observations together with quasilinear theory provide direct evidence that the observed electron precipitation at higher energy (>~700 keV) is primarily driven by EMIC waves. However, the newly observed feature of the simultaneous electron precipitation extending down to ~30 keV is not supported by existing theories and raises an interesting question on whether EMIC waves can scatter such low-energy electrons.},
doi = {10.1029/2018GL078604},
journal = {Geophysical Research Letters},
number = 14,
volume = 45,
place = {United States},
year = {Thu Jul 05 00:00:00 EDT 2018},
month = {Thu Jul 05 00:00:00 EDT 2018}
}
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https://doi.org/10.1029/2018GL078604
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    Works referencing / citing this record:

    Precipitation of Radiation Belt Electrons by EMIC Waves With Conjugated Observations of NOAA and Van Allen Satellites
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    Energetic Electron Precipitation: Multievent Analysis of Its Spatial Extent During EMIC Wave Activity
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