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Relativistic-electron dropouts and recovery: A superposed epoch study of the magnetosphere and the solar wind

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Relativistic-electron dropouts and recovery: A superposed epoch study of the magnetosphere and the solar wind. / Borovsky, J. E.; Denton, Michael H.
In: Journal of Geophysical Research, Vol. 114, No. A02201, 02.2009, p. 1-27.

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Borovsky JE, Denton MH. Relativistic-electron dropouts and recovery: A superposed epoch study of the magnetosphere and the solar wind. Journal of Geophysical Research. 2009 Feb;114(A02201):1-27. doi: 10.1029/2008JA013128

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Borovsky, J. E. ; Denton, Michael H. / Relativistic-electron dropouts and recovery: A superposed epoch study of the magnetosphere and the solar wind. In: Journal of Geophysical Research. 2009 ; Vol. 114, No. A02201. pp. 1-27.

Bibtex

@article{21a6c5c68896415790bfd4c092ed003c,
title = "Relativistic-electron dropouts and recovery: A superposed epoch study of the magnetosphere and the solar wind",
abstract = "During 124 high-speed-stream-driven storms from two solar cycles, a multispacecraft average of the 1.1–1.5 MeV electron flux measured at geosynchronous orbit is examined to study global dropouts of the flux. Solar wind and magnetospheric measurements are analyzed with a superposed epoch technique, with the superpositions triggered by storm-convection onset, by onset of the relativistic-electron dropouts, and by recovery of the dropouts. It is found that the onset of dropout occurs after the passage of the IMF sector reversal prior to the passage of the corotating interaction region (CIR) stream interface. The recovery from dropout commences during the passage of the compressed fast wind. Relativistic-electron-dropout onset is temporally associated with the onset of the superdense ion and electron plasma sheet, with the onset of the extra-hot ion and electron plasma sheet and with the formation of the plasmaspheric drainage plume. Dropout recovery is associated with the termination of the superdense plasma sheet and with a decay of the plasmaspheric drainage plume. When there is appreciable spatial overlap of the superdense ion plasma sheet with the drainage plume, dropouts occur, and when that overlap ends, dropouts recover. This points to pitch-angle scattering by electromagnetic ion-cyclotron (EMIC) waves as the primary cause of the relativistic-electron dropouts, with the waves residing in the lumpy drainage plumes driven by the superdense ion plasma sheet. The drainage plume is caused by enhanced magnetospheric convection associated with southward (GSM) magnetic field after the IMF sector reversal. The superdense plasma sheet has its origin in the compressed slow wind of the CIR.",
keywords = "HSS radiation belt EMIC DCS-publications-id, art-934, DCS-publications-credits, iono, DCS-publications-personnel-id, 123",
author = "Borovsky, {J. E.} and Denton, {Michael H.}",
note = "Copyright (2009) American Geophysical Union. Further reproduction or electronic distribution is not permitted",
year = "2009",
month = feb,
doi = "10.1029/2008JA013128",
language = "English",
volume = "114",
pages = "1--27",
journal = "Journal of Geophysical Research",
issn = "0148-0227",
publisher = "American Geophysical Union",
number = "A02201",

}

RIS

TY - JOUR

T1 - Relativistic-electron dropouts and recovery: A superposed epoch study of the magnetosphere and the solar wind

AU - Borovsky, J. E.

AU - Denton, Michael H.

N1 - Copyright (2009) American Geophysical Union. Further reproduction or electronic distribution is not permitted

PY - 2009/2

Y1 - 2009/2

N2 - During 124 high-speed-stream-driven storms from two solar cycles, a multispacecraft average of the 1.1–1.5 MeV electron flux measured at geosynchronous orbit is examined to study global dropouts of the flux. Solar wind and magnetospheric measurements are analyzed with a superposed epoch technique, with the superpositions triggered by storm-convection onset, by onset of the relativistic-electron dropouts, and by recovery of the dropouts. It is found that the onset of dropout occurs after the passage of the IMF sector reversal prior to the passage of the corotating interaction region (CIR) stream interface. The recovery from dropout commences during the passage of the compressed fast wind. Relativistic-electron-dropout onset is temporally associated with the onset of the superdense ion and electron plasma sheet, with the onset of the extra-hot ion and electron plasma sheet and with the formation of the plasmaspheric drainage plume. Dropout recovery is associated with the termination of the superdense plasma sheet and with a decay of the plasmaspheric drainage plume. When there is appreciable spatial overlap of the superdense ion plasma sheet with the drainage plume, dropouts occur, and when that overlap ends, dropouts recover. This points to pitch-angle scattering by electromagnetic ion-cyclotron (EMIC) waves as the primary cause of the relativistic-electron dropouts, with the waves residing in the lumpy drainage plumes driven by the superdense ion plasma sheet. The drainage plume is caused by enhanced magnetospheric convection associated with southward (GSM) magnetic field after the IMF sector reversal. The superdense plasma sheet has its origin in the compressed slow wind of the CIR.

AB - During 124 high-speed-stream-driven storms from two solar cycles, a multispacecraft average of the 1.1–1.5 MeV electron flux measured at geosynchronous orbit is examined to study global dropouts of the flux. Solar wind and magnetospheric measurements are analyzed with a superposed epoch technique, with the superpositions triggered by storm-convection onset, by onset of the relativistic-electron dropouts, and by recovery of the dropouts. It is found that the onset of dropout occurs after the passage of the IMF sector reversal prior to the passage of the corotating interaction region (CIR) stream interface. The recovery from dropout commences during the passage of the compressed fast wind. Relativistic-electron-dropout onset is temporally associated with the onset of the superdense ion and electron plasma sheet, with the onset of the extra-hot ion and electron plasma sheet and with the formation of the plasmaspheric drainage plume. Dropout recovery is associated with the termination of the superdense plasma sheet and with a decay of the plasmaspheric drainage plume. When there is appreciable spatial overlap of the superdense ion plasma sheet with the drainage plume, dropouts occur, and when that overlap ends, dropouts recover. This points to pitch-angle scattering by electromagnetic ion-cyclotron (EMIC) waves as the primary cause of the relativistic-electron dropouts, with the waves residing in the lumpy drainage plumes driven by the superdense ion plasma sheet. The drainage plume is caused by enhanced magnetospheric convection associated with southward (GSM) magnetic field after the IMF sector reversal. The superdense plasma sheet has its origin in the compressed slow wind of the CIR.

KW - HSS radiation belt EMIC DCS-publications-id

KW - art-934

KW - DCS-publications-credits

KW - iono

KW - DCS-publications-personnel-id

KW - 123

UR - http://www.scopus.com/inward/record.url?scp=66149171504&partnerID=8YFLogxK

U2 - 10.1029/2008JA013128

DO - 10.1029/2008JA013128

M3 - Journal article

VL - 114

SP - 1

EP - 27

JO - Journal of Geophysical Research

JF - Journal of Geophysical Research

SN - 0148-0227

IS - A02201

ER -