Structured subauroral polarization streams and related auroral undulations occurring on the storm day of 21 January 2005

Horvath, Ildiko and Lovell, Brian C. (2016) Structured subauroral polarization streams and related auroral undulations occurring on the storm day of 21 January 2005. Journal of Geophysical Research A: Space Physics, 121 2: 1680-1695. doi:10.1002/2015JA022057

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Author Horvath, Ildiko
Lovell, Brian C.
Title Structured subauroral polarization streams and related auroral undulations occurring on the storm day of 21 January 2005
Journal name Journal of Geophysical Research A: Space Physics   Check publisher's open access policy
ISSN 2169-9402
2169-9380
Publication date 2016-02-01
Year available 2016
Sub-type Article (original research)
DOI 10.1002/2015JA022057
Open Access Status File (Publisher version)
Volume 121
Issue 2
Start page 1680
End page 1695
Total pages 16
Place of publication Hoboken, NJ United States
Publisher Wiley-Blackwell Publishing
Collection year 2017
Language eng
Formatted abstract
We investigate structured subauroral polarization streams (SAPS) and their impacts on the midlatitude trough and auroral regions during the 21–22 January 2005 geomagnetic storm. This was a storm with two sudden commencements occurring under varying interplanetary magnetic field (IMF) conditions and three main phases, two of them unfolding during northward IMF. Its onset at ~1700 UT allowed us to investigate SAPS wave structures (WS) and their impacts during the local evening hours under both southward and northward IMF conditions in the American sector. Results suggest that during southward IMF, SAPS-WS might be related with standing (toroidal) Alfven waves and structured most intensively the stagnation trough. During northward IMF, the trough was created by SAPS electric (E) field effects only and became less structured by SAPS-WS that were of Alfvenic origin. Auroral wave structures and undulations occurred in the structured and unstructured oval regions, respectively, and triggered the subauroral region's response to produce SAPS-WS. Spectrogram images (only one shown) confirmed ring current injections implying magnetotail reconnections during the four SAPS-WS events investigated. Periodic tail connections are also evidenced by the periodic increases seen in both the solar wind-magnetosphere coupling function (ε) and the energy input efficiency. Finally, we conclude for the time period investigated that (1) the nature of SAPS-WS was informative of IMF orientation, (2) plasma stagnation enhanced SAPS E field and SAPS-WS development, and (3) more efficient energy input into the magnetosphere contributed to the better development of auroral undulations and SAPS-WS.
Keyword Dayside reconnection
Magnetotail connection
SAPS E field
SAPS wave structures
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: HERDC Pre-Audit
School of Information Technology and Electrical Engineering Publications
 
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