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Title: Multiple loss processes of relativistic electrons outside the heart of outer radiation belt during a storm sudden commencement

Abstract

By examining the compression-induced changes in the electron phase space density and pitch angle distribution observed by two satellites of Van Allen Probes (RBSP-A/B), we find that the relativistic electrons (>2 MeV) outside the heart of outer radiation belt (L*≥5) undergo multiple losses during a storm sudden commencement. The relativistic electron loss mainly occurs in the field-aligned direction (pitch angle α < 30° or >150°), and the flux decay of the field-aligned electrons is independent of the spatial location variations of the two satellites. However, the relativistic electrons in the pitch angle range of 30°–150° increase (decrease) with the decreasing (increasing) geocentric distance (|ΔL|<0.25) of the RBSP-B (RBSP-A) location, and the electron fluxes in the quasi-perpendicular direction display energy-dispersive oscillations in the Pc5 period range (2–10 min). The relativistic electron loss is confirmed by the decrease of electron phase space density at high-L shell after the magnetospheric compressions, and their loss is associated with the intense plasmaspheric hiss, electromagnetic ion cyclotron (EMIC) waves, relativistic electron precipitation (observed by POES/NOAA satellites at 850 km), and magnetic field fluctuations in the Pc5 band. Finally, the intense EMIC waves and whistler mode hiss jointly cause the rapidly pitch angle scattering loss of themore » relativistic electrons within 10 h. Moreover, the Pc5 ULF waves also lead to the slowly outward radial diffusion of the relativistic electrons in the high-L region with a negative electron phase space density gradient.« less

Authors:
 [1];  [1];  [1];  [2]; ORCiD logo [3];  [4];  [5];  [6]
  1. Beihang Univ., Beijing (China). School of Astronautics
  2. Wuhan Univ. (China). School of Electronic Information
  3. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  4. Univ. of Colorado, Boulder, CO (United States)
  5. Aerospace Corporation, Los Angeles, CA (United States)
  6. Univ. of New Hampshire, Durham, NH (United States). Inst. for the Study of Earth, Oceans, and Space
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
National Aeronautic and Space Administration (NASA); National Natural Science Foundation of China (NNSFC); USDOE
OSTI Identifier:
1402600
Report Number(s):
LA-UR-15-28803
Journal ID: ISSN 2169-9380; TRN: US1703001
Grant/Contract Number:  
AC52-06NA25396; 41374165; 41431071; 967399; NAS5-01072
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Geophysical Research. Space Physics
Additional Journal Information:
Journal Volume: 120; Journal Issue: 12; Journal ID: ISSN 2169-9380
Publisher:
American Geophysical Union
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; 58 GEOSCIENCES; Heliospheric and Magnetospheric Physics; storm sudden commencement; outer radiation belt; relativistic electron loss; electromagnetic ion cyclotron (EMIC) waves; plasmaspheric hiss; outward radial diffusion driven by ULF waves

Citation Formats

Yu, J., Li, L. Y., Cao, J. B., Yuan, Z. G., Reeves, Geoffrey D., Baker, D. N., Blake, J. B., and Spence, H. Multiple loss processes of relativistic electrons outside the heart of outer radiation belt during a storm sudden commencement. United States: N. p., 2015. Web. doi:10.1002/2015JA021460.
Yu, J., Li, L. Y., Cao, J. B., Yuan, Z. G., Reeves, Geoffrey D., Baker, D. N., Blake, J. B., & Spence, H. Multiple loss processes of relativistic electrons outside the heart of outer radiation belt during a storm sudden commencement. United States. doi:10.1002/2015JA021460.
Yu, J., Li, L. Y., Cao, J. B., Yuan, Z. G., Reeves, Geoffrey D., Baker, D. N., Blake, J. B., and Spence, H. Tue . "Multiple loss processes of relativistic electrons outside the heart of outer radiation belt during a storm sudden commencement". United States. doi:10.1002/2015JA021460. https://www.osti.gov/servlets/purl/1402600.
@article{osti_1402600,
title = {Multiple loss processes of relativistic electrons outside the heart of outer radiation belt during a storm sudden commencement},
author = {Yu, J. and Li, L. Y. and Cao, J. B. and Yuan, Z. G. and Reeves, Geoffrey D. and Baker, D. N. and Blake, J. B. and Spence, H.},
abstractNote = {By examining the compression-induced changes in the electron phase space density and pitch angle distribution observed by two satellites of Van Allen Probes (RBSP-A/B), we find that the relativistic electrons (>2 MeV) outside the heart of outer radiation belt (L*≥5) undergo multiple losses during a storm sudden commencement. The relativistic electron loss mainly occurs in the field-aligned direction (pitch angle α < 30° or >150°), and the flux decay of the field-aligned electrons is independent of the spatial location variations of the two satellites. However, the relativistic electrons in the pitch angle range of 30°–150° increase (decrease) with the decreasing (increasing) geocentric distance (|ΔL|<0.25) of the RBSP-B (RBSP-A) location, and the electron fluxes in the quasi-perpendicular direction display energy-dispersive oscillations in the Pc5 period range (2–10 min). The relativistic electron loss is confirmed by the decrease of electron phase space density at high-L shell after the magnetospheric compressions, and their loss is associated with the intense plasmaspheric hiss, electromagnetic ion cyclotron (EMIC) waves, relativistic electron precipitation (observed by POES/NOAA satellites at 850 km), and magnetic field fluctuations in the Pc5 band. Finally, the intense EMIC waves and whistler mode hiss jointly cause the rapidly pitch angle scattering loss of the relativistic electrons within 10 h. Moreover, the Pc5 ULF waves also lead to the slowly outward radial diffusion of the relativistic electrons in the high-L region with a negative electron phase space density gradient.},
doi = {10.1002/2015JA021460},
journal = {Journal of Geophysical Research. Space Physics},
number = 12,
volume = 120,
place = {United States},
year = {2015},
month = {11}
}

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