Superposed epoch analyses of ion temperatures during CME- and CIR/HSS-driven storms

A. M. Keesee; J. G. Elfritz; M. C. Fok; D. J. McComas; E. E. Scime

doi:10.1016/j.jastp.2013.08.009

Superposed epoch analyses of ion temperatures during CME- and CIR/HSS-driven storms

A. M. Keesee, J. G. Elfritz, M. C. Fok, D. J. McComas, E. E. Scime

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23 Scopus citations

Abstract

Coronal mass ejections (CMEs) and corotating interaction regions associated with high speed solar wind streams (CIR/HSSs) drive geomagnetic storms in the terrestrial magnetosphere. Each type of storm driver yields different dynamics of storm evolution. We present results from comparative superposed epoch analyses of global ion temperatures calculated from TWINS energetic neutral atom (ENA) data and simulations using the comprehensive ring current model (CRCM). During the June 2008-April 2012 timeframe, 48 geomagnetic storms (minimum Dst≤-40. nT) occurred. Of these, 21 storms were CME-driven and 15 were driven by CIR/HSSs. Superposed epoch analysis results demonstrate that ion temperatures increase during the recovery phase of CIR/HSS-driven storms, while ions are rapidly heated at the commencement of CME-driven storms then cool over the main phase, particularly for intense (minimum Dst≤-78. nT) CME-driven storms. Higher energy ions are convected to lower L-shells during CME-driven storms, while CIR/HSS-driven storms tend to have average ion temperatures that are higher on the dayside than nightside.

Original language	English (US)
Pages (from-to)	67-78
Number of pages	12
Journal	Journal of Atmospheric and Solar-Terrestrial Physics
Volume	115-116
DOIs	https://doi.org/10.1016/j.jastp.2013.08.009
State	Published - Aug 2014
Externally published	Yes

All Science Journal Classification (ASJC) codes

Geophysics
Atmospheric Science
Space and Planetary Science

Keywords

CME
Corotating interaction region
Geomagnetic storm
High speed stream
Ion temperature
Magnetosphere

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10.1016/j.jastp.2013.08.009

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@article{6eca79a08704475689ac3c807c15c204,

title = "Superposed epoch analyses of ion temperatures during CME- and CIR/HSS-driven storms",

abstract = "Coronal mass ejections (CMEs) and corotating interaction regions associated with high speed solar wind streams (CIR/HSSs) drive geomagnetic storms in the terrestrial magnetosphere. Each type of storm driver yields different dynamics of storm evolution. We present results from comparative superposed epoch analyses of global ion temperatures calculated from TWINS energetic neutral atom (ENA) data and simulations using the comprehensive ring current model (CRCM). During the June 2008-April 2012 timeframe, 48 geomagnetic storms (minimum Dst≤-40. nT) occurred. Of these, 21 storms were CME-driven and 15 were driven by CIR/HSSs. Superposed epoch analysis results demonstrate that ion temperatures increase during the recovery phase of CIR/HSS-driven storms, while ions are rapidly heated at the commencement of CME-driven storms then cool over the main phase, particularly for intense (minimum Dst≤-78. nT) CME-driven storms. Higher energy ions are convected to lower L-shells during CME-driven storms, while CIR/HSS-driven storms tend to have average ion temperatures that are higher on the dayside than nightside.",

keywords = "CME, Corotating interaction region, Geomagnetic storm, High speed stream, Ion temperature, Magnetosphere",

author = "Keesee, {A. M.} and Elfritz, {J. G.} and Fok, {M. C.} and McComas, {D. J.} and Scime, {E. E.}",

note = "Funding Information: This work was carried out as a part of the TWINS NASA Explorer mission; work at WVU was supported under subcontract to the Southwest Research Institute, NASA EPSCoR grant NNX10AN08A and NSF grant AGS-1113478 . We would like to thank members of the TWINS science team for helpful discussions regarding the TWINS ENA data. We gratefully acknowledge the use of solar wind data and geomagnetic indices provided by OMNIWeb and Kyoto World Data Center for Geomagnetism. ",

year = "2014",

month = aug,

doi = "10.1016/j.jastp.2013.08.009",

language = "English (US)",

volume = "115-116",

pages = "67--78",

journal = "Journal of Atmospheric and Solar-Terrestrial Physics",

issn = "1364-6826",

publisher = "Elsevier Ltd",

}

TY - JOUR

T1 - Superposed epoch analyses of ion temperatures during CME- and CIR/HSS-driven storms

AU - Keesee, A. M.

AU - Elfritz, J. G.

AU - Fok, M. C.

AU - McComas, D. J.

AU - Scime, E. E.

N1 - Funding Information: This work was carried out as a part of the TWINS NASA Explorer mission; work at WVU was supported under subcontract to the Southwest Research Institute, NASA EPSCoR grant NNX10AN08A and NSF grant AGS-1113478 . We would like to thank members of the TWINS science team for helpful discussions regarding the TWINS ENA data. We gratefully acknowledge the use of solar wind data and geomagnetic indices provided by OMNIWeb and Kyoto World Data Center for Geomagnetism.

PY - 2014/8

Y1 - 2014/8

N2 - Coronal mass ejections (CMEs) and corotating interaction regions associated with high speed solar wind streams (CIR/HSSs) drive geomagnetic storms in the terrestrial magnetosphere. Each type of storm driver yields different dynamics of storm evolution. We present results from comparative superposed epoch analyses of global ion temperatures calculated from TWINS energetic neutral atom (ENA) data and simulations using the comprehensive ring current model (CRCM). During the June 2008-April 2012 timeframe, 48 geomagnetic storms (minimum Dst≤-40. nT) occurred. Of these, 21 storms were CME-driven and 15 were driven by CIR/HSSs. Superposed epoch analysis results demonstrate that ion temperatures increase during the recovery phase of CIR/HSS-driven storms, while ions are rapidly heated at the commencement of CME-driven storms then cool over the main phase, particularly for intense (minimum Dst≤-78. nT) CME-driven storms. Higher energy ions are convected to lower L-shells during CME-driven storms, while CIR/HSS-driven storms tend to have average ion temperatures that are higher on the dayside than nightside.

AB - Coronal mass ejections (CMEs) and corotating interaction regions associated with high speed solar wind streams (CIR/HSSs) drive geomagnetic storms in the terrestrial magnetosphere. Each type of storm driver yields different dynamics of storm evolution. We present results from comparative superposed epoch analyses of global ion temperatures calculated from TWINS energetic neutral atom (ENA) data and simulations using the comprehensive ring current model (CRCM). During the June 2008-April 2012 timeframe, 48 geomagnetic storms (minimum Dst≤-40. nT) occurred. Of these, 21 storms were CME-driven and 15 were driven by CIR/HSSs. Superposed epoch analysis results demonstrate that ion temperatures increase during the recovery phase of CIR/HSS-driven storms, while ions are rapidly heated at the commencement of CME-driven storms then cool over the main phase, particularly for intense (minimum Dst≤-78. nT) CME-driven storms. Higher energy ions are convected to lower L-shells during CME-driven storms, while CIR/HSS-driven storms tend to have average ion temperatures that are higher on the dayside than nightside.

KW - CME

KW - Corotating interaction region

KW - Geomagnetic storm

KW - High speed stream

KW - Ion temperature

KW - Magnetosphere

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M3 - Article

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SN - 1364-6826

VL - 115-116

SP - 67

EP - 78

JO - Journal of Atmospheric and Solar-Terrestrial Physics

JF - Journal of Atmospheric and Solar-Terrestrial Physics

ER -

Superposed epoch analyses of ion temperatures during CME- and CIR/HSS-driven storms

Abstract

All Science Journal Classification (ASJC) codes

Keywords

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