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Title: Fast Diffusion of Ultrarelativistic Electrons in the Outer Radiation Belt: 17 March 2015 Storm Event

Abstract

Inward radial diffusion driven by ULF waves has long been known to be capable of accelerating radiation belt electrons to very high energies within the heart of the belts, but more recent work has shown that radial diffusion values can be highly event-specific, and mean values or empirical models may not capture the full significance of radial diffusion to acceleration events. Here we present an event of fast inward radial diffusion, occurring during a period following the geomagnetic storm of 17 March 2015. Ultrarelativistic electrons up to ~8 MeV are accelerated in the absence of intense higher-frequency plasma waves, indicating an acceleration event in the core of the outer belt driven primarily or entirely by ULF wave-driven diffusion. We examine this fast diffusion rate along with derived radial diffusion coefficients using particle and fields instruments on the Van Allen Probes spacecraft mission.

Authors:
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [3]; ORCiD logo [3]; ORCiD logo [3]; ORCiD logo [3];  [4]; ORCiD logo [5]; ORCiD logo [1]; ORCiD logo [6]
  1. Univ. of Iowa, Iowa City, IA (United States)
  2. Kirtland Air Force Base, Albuquerque, NM (United States). Air Force Research Lab; Univ. of Colorado, Boulder, CO (United States). Lab. for Atmospheric and Space Science
  3. Univ. of Colorado, Boulder, CO (United States). Lab. for Atmospheric and Space Science
  4. NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States). Division of Heliophysics
  5. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  6. Univ. of Minnesota, Twin Cities, MN (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE Laboratory Directed Research and Development (LDRD) Program; National Aeronautic and Space Administration (NASA); USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1597364
Report Number(s):
[LA-UR-19-30974]
[Journal ID: ISSN 0094-8276]
Grant/Contract Number:  
[89233218CNA000001; 967399; NAS5-01072]
Resource Type:
Accepted Manuscript
Journal Name:
Geophysical Research Letters
Additional Journal Information:
[ Journal Volume: 45; Journal Issue: 20]; 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; magnetosphere; radiation belts; radial diffusion; ULF waves

Citation Formats

Jaynes, Allison N., Ali, A. F., Elkington, Scott R., Malaspina, David M., Baker, Dan N., Li, X., Kanekal, Shri G., Henderson, Michael Gerard, Kletzing, C. A., and Wygant, John R. Fast Diffusion of Ultrarelativistic Electrons in the Outer Radiation Belt: 17 March 2015 Storm Event. United States: N. p., 2018. Web. doi:10.1029/2018GL079786.
Jaynes, Allison N., Ali, A. F., Elkington, Scott R., Malaspina, David M., Baker, Dan N., Li, X., Kanekal, Shri G., Henderson, Michael Gerard, Kletzing, C. A., & Wygant, John R. Fast Diffusion of Ultrarelativistic Electrons in the Outer Radiation Belt: 17 March 2015 Storm Event. United States. doi:10.1029/2018GL079786.
Jaynes, Allison N., Ali, A. F., Elkington, Scott R., Malaspina, David M., Baker, Dan N., Li, X., Kanekal, Shri G., Henderson, Michael Gerard, Kletzing, C. A., and Wygant, John R. Wed . "Fast Diffusion of Ultrarelativistic Electrons in the Outer Radiation Belt: 17 March 2015 Storm Event". United States. doi:10.1029/2018GL079786. https://www.osti.gov/servlets/purl/1597364.
@article{osti_1597364,
title = {Fast Diffusion of Ultrarelativistic Electrons in the Outer Radiation Belt: 17 March 2015 Storm Event},
author = {Jaynes, Allison N. and Ali, A. F. and Elkington, Scott R. and Malaspina, David M. and Baker, Dan N. and Li, X. and Kanekal, Shri G. and Henderson, Michael Gerard and Kletzing, C. A. and Wygant, John R.},
abstractNote = {Inward radial diffusion driven by ULF waves has long been known to be capable of accelerating radiation belt electrons to very high energies within the heart of the belts, but more recent work has shown that radial diffusion values can be highly event-specific, and mean values or empirical models may not capture the full significance of radial diffusion to acceleration events. Here we present an event of fast inward radial diffusion, occurring during a period following the geomagnetic storm of 17 March 2015. Ultrarelativistic electrons up to ~8 MeV are accelerated in the absence of intense higher-frequency plasma waves, indicating an acceleration event in the core of the outer belt driven primarily or entirely by ULF wave-driven diffusion. We examine this fast diffusion rate along with derived radial diffusion coefficients using particle and fields instruments on the Van Allen Probes spacecraft mission.},
doi = {10.1029/2018GL079786},
journal = {Geophysical Research Letters},
number = [20],
volume = [45],
place = {United States},
year = {2018},
month = {9}
}

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