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Title: Multi-satellite simultaneous observations of magnetopause and atmospheric losses of radiation belt electrons during an intense solar wind dynamic pressure pulse

Abstract

Radiation belt electron flux dropouts are a kind of drastic variation in the Earth's magnetosphere, understanding of which is of both scientific and societal importance. We report multi-satellite simultaneous observations of magnetopause and atmospheric losses of radiation belt electrons during an event of intense solar wind dynamic pressure pulse, using electron flux data from a group of 14 satellites. Moreover, when the pulse occurred, magnetopause and atmospheric loss could take effect concurrently contributing to the electron flux dropout. Losses through the magnetopause were observed to be efficient and significant at L ≳ 5, owing to the magnetopause intrusion into L ~6 and outward radial diffusion associated with sharp negative gradient in electron phase space density. Losses to the atmosphere were directly identified from the precipitating electron flux observations, for which pitch angle scattering by plasma waves could be mainly responsible. While the convection and substorm injections strongly enhanced the energetic electron fluxes up to hundreds of keV, they could delay other than avoid the occurrence of electron flux dropout at these energies. Finally, we demonstrate that the pulse-time radiation belt electron flux dropout depends strongly on the specific interplanetary and magnetospheric conditions and that losses through the magnetopause and tomore » the atmosphere and enhancements of substorm injection play an essential role in combination, which should be incorporated as a whole into future simulations for comprehending the nature of radiation belt electron flux dropouts.« less

Authors:
 [1];  [1];  [2];  [2];  [2];  [2];  [3];  [4];  [3];  [5];  [3];  [6];  [7]
  1. Wuhan Univ., Hubei (China); Chinese Academy of Sciences (CAS), Beijing (China)
  2. Wuhan Univ., Hubei (China)
  3. Chinese Academy of Sciences (CAS), Beijing (China)
  4. China Meteorological Admininstration, Beijing (China)
  5. Univ. of Colorado, Boulder, CO (United States)
  6. Univ. of New Hampshire, Durham, NH (United States)
  7. 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.:
USDOE
OSTI Identifier:
1291220
Report Number(s):
LA-UR-15-27237
Journal ID: ISSN 1432-0576
Grant/Contract Number:  
AC52-06NA25396
Resource Type:
Accepted Manuscript
Journal Name:
Annales Geophysicae (Online)
Additional Journal Information:
Journal Name: Annales Geophysicae (Online); Journal Volume: 34; Journal Issue: 5; Journal ID: ISSN 1432-0576
Publisher:
European Geophysical Union
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; magnetospheric physics (energetic particles precipitating; magnetospheric configuration and dynamics; space plasma physics (wave-particle interactions)

Citation Formats

Xiang, Zheng, Ni, Binbin, Zhou, Chen, Zou, Zhengyang, Gu, Xudong, Zhao, Zhengyu, Zhang, Xianguo, Zhang, Xiaoxin, Zhang, Shenyi, Li, Xinlin, Zuo, Pingbing, Spence, Harlan, and Reeves, Geoffrey. Multi-satellite simultaneous observations of magnetopause and atmospheric losses of radiation belt electrons during an intense solar wind dynamic pressure pulse. United States: N. p., 2016. Web. doi:10.5194/angeo-34-493-2016.
Xiang, Zheng, Ni, Binbin, Zhou, Chen, Zou, Zhengyang, Gu, Xudong, Zhao, Zhengyu, Zhang, Xianguo, Zhang, Xiaoxin, Zhang, Shenyi, Li, Xinlin, Zuo, Pingbing, Spence, Harlan, & Reeves, Geoffrey. Multi-satellite simultaneous observations of magnetopause and atmospheric losses of radiation belt electrons during an intense solar wind dynamic pressure pulse. United States. doi:10.5194/angeo-34-493-2016.
Xiang, Zheng, Ni, Binbin, Zhou, Chen, Zou, Zhengyang, Gu, Xudong, Zhao, Zhengyu, Zhang, Xianguo, Zhang, Xiaoxin, Zhang, Shenyi, Li, Xinlin, Zuo, Pingbing, Spence, Harlan, and Reeves, Geoffrey. Tue . "Multi-satellite simultaneous observations of magnetopause and atmospheric losses of radiation belt electrons during an intense solar wind dynamic pressure pulse". United States. doi:10.5194/angeo-34-493-2016. https://www.osti.gov/servlets/purl/1291220.
@article{osti_1291220,
title = {Multi-satellite simultaneous observations of magnetopause and atmospheric losses of radiation belt electrons during an intense solar wind dynamic pressure pulse},
author = {Xiang, Zheng and Ni, Binbin and Zhou, Chen and Zou, Zhengyang and Gu, Xudong and Zhao, Zhengyu and Zhang, Xianguo and Zhang, Xiaoxin and Zhang, Shenyi and Li, Xinlin and Zuo, Pingbing and Spence, Harlan and Reeves, Geoffrey},
abstractNote = {Radiation belt electron flux dropouts are a kind of drastic variation in the Earth's magnetosphere, understanding of which is of both scientific and societal importance. We report multi-satellite simultaneous observations of magnetopause and atmospheric losses of radiation belt electrons during an event of intense solar wind dynamic pressure pulse, using electron flux data from a group of 14 satellites. Moreover, when the pulse occurred, magnetopause and atmospheric loss could take effect concurrently contributing to the electron flux dropout. Losses through the magnetopause were observed to be efficient and significant at L ≳ 5, owing to the magnetopause intrusion into L ~6 and outward radial diffusion associated with sharp negative gradient in electron phase space density. Losses to the atmosphere were directly identified from the precipitating electron flux observations, for which pitch angle scattering by plasma waves could be mainly responsible. While the convection and substorm injections strongly enhanced the energetic electron fluxes up to hundreds of keV, they could delay other than avoid the occurrence of electron flux dropout at these energies. Finally, we demonstrate that the pulse-time radiation belt electron flux dropout depends strongly on the specific interplanetary and magnetospheric conditions and that losses through the magnetopause and to the atmosphere and enhancements of substorm injection play an essential role in combination, which should be incorporated as a whole into future simulations for comprehending the nature of radiation belt electron flux dropouts.},
doi = {10.5194/angeo-34-493-2016},
journal = {Annales Geophysicae (Online)},
number = 5,
volume = 34,
place = {United States},
year = {2016},
month = {5}
}

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