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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Structured subauroral polarization streams and related auroral undulations occurring on the storm day of 21 January 2005
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Structured subauroral polarization streams and related auroral undulations occurring on the storm day of 21 January 2005

机译：结构化subauroral极化流和相关极光发生波动2005年1月21日风暴的一天

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摘要

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.
机译：我们研究结构化subauroral极化流(SAPS)及其影响中间纬度槽和极光的地区于2005年1月21日至22日地磁风暴。风暴和两个突然是否已经发生在不同的行星际磁场(IMF)条件和三个主要阶段,两个在国际货币基金组织(IMF)向北展开。~ 1700 UT允许我们削弱了波进行调查在结构(WS)及其影响在向南和当地晚上小时北方国际货币基金组织的条件在美国部门。结果表明,在国际货币基金组织(IMF)向南,SAPS-WS可能与站(环形)阿尔芬波和结构化最密集停滞槽。槽是由削弱了电动(E)仅影响,变得不那么结构化SAPS-WS Alfvenic原产地。波结构和波动发生在结构化和非结构化椭圆区域,分别引发了subauroral生产SAPS-WS区域的反应。图像(如图所示)只有一个证实环电流注射暗示磁尾重新连接在四个SAPS-WS事件调查。周期性的尾部连接也证明了这一点定期增加两个太阳wind-magnetosphere耦合(ε)和函数能量输入效率。(1)的时间调查SAPS-WS IMF取向的信息,(2)增强削弱了E场和等离子体停滞SAPS-WS发展,(3)更有效率能量输入磁气圈的贡献极光起伏的更好的发展和SAPS-WS。

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