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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Observations of global ionospheric responses to the 2009 stratospheric sudden warming event by FORMOSAT-3/COSMIC
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Observations of global ionospheric responses to the 2009 stratospheric sudden warming event by FORMOSAT-3/COSMIC

机译：观测的全球电离层响应2009年的平流层突然变暖事件FORMOSAT-3 /宇宙

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摘要

The global ionospheric response to a stratospheric sudden warming (SSW) is studied using three-dimensional electron density maps derived from radio occultation observations of FORMOSAT-3/COSMIC during the 2009 SSW periods. Results show that the ionospheric electron density at EIA crests exhibit a morning/early afternoon increase followed by an afternoon decrease and an evening increase, indicative of a semidiurnal component during the SSW period, which is consistent with recent studies. The latitude-altitude electron density slice maps show that the SSW related modifications of the equatorial plasma fountain interact with the existing summer-to-winter neutral winds and resulting in a north-south asymmetry. The global ionospheric response shows a clear longitudinal dependence in the equatorial plasma fountain enhancement during morning/early afternoon, inferred from the duration of the equatorial ionization anomaly(EIA)enhancement. Following the enhancement, prominent global EIA reductions resulting from the equatorial plasma fountain weakening in the afternoon sector are seen. The ionospheric response to the 2009 SSW event is also compared with the usual seasonal variation during January-February 2007. Instead of showing the electron density increase in the northern hemisphere and decrease in the southern hemisphere as the usual seasonal variation does, the SSW period ionosphere shows prominent global electron density reductions in the afternoon period during the 2009 SSW event.
机译：全球电离层响应平流层突然变暖(f)研究使用三维电子密度图从无线电掩星观测FORMOSAT-3 /宇宙时期西南偏南约在2009年。结果表明,电离层电子EIA波峰密度表现出早期早上/下午增加了一个下午减少和增加一个晚上,象征半日组件量期间,这与最近的研究是一致的。latitude-altitude电子密度切片地图表明,该量相关的修改赤道等离子体与喷泉现有的春夏秋冬中性风和导致南北不对称。显示一个明确的纵向电离层响应依赖在赤道等离子喷泉增强在早上/下午早些时候,推断出从赤道的持续时间电离异常(EIA)的提高。增强,突出全球环境影响评价降低赤道等离子体产生的喷泉下午部门削弱。电离层响应事件是西南偏南约2009年也与通常的季节性变化在2007年1 - 2月刊。北方电子密度增加半球,减少在南部半球是通常的季节性变化,量时期全球电离层显示突出下午电子密度减少期间事件西南偏南约2009。

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