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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Impact of sudden stratospheric warmings on equatorial ionization anomaly
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Impact of sudden stratospheric warmings on equatorial ionization anomaly

机译：突然的变暖的影响赤道电离异常

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摘要

We investigate the ionospheric response to several stratospheric sudden warming events which occurred in Northern Hemisphere winters of 2008 and 2009 during solar minimum conditions. We use GPS total electron content data in a broad latitudinal region at ±40° geographic latitude and a single longitude, 75°W. In all cases, we find a strong daytime ionospheric response to stratospheric sudden warmings. This response is characterized by a semidiurnal character, large amplitude, and persistence of perturbations for up to 3 weeks after the peak in high-latitude stratospheric temperatures. The ionospheric perturbations at the lower latitudes usually begin a few days after the peak in stratospheric temperature and are observed as an enhancement of the equatorial ionization anomaly (EIA) in the morning sector and a suppression of the EIA in the afternoon sector. There is also evidence of a secondary enhancement in the postsunset hours. Once observed in the low latitudes, the phase of semidiurnal perturbations progressively shifts to later local times in subsequent days. This progressive shift occurs at a different rate for different stratospheric warming events. The large magnitude and persistence of ionospheric perturbations, together with the predictability of stratospheric sudden warmings several days in advance, present an opportunity to investigate these phenomena in a systematic manner which may eventually lead to a multiday forecast of low-latitude ionosphere conditions.
机译：我们研究电离层响应几个平流层突然变暖事件发生在2008年北半球的冬天期间和2009年太阳能最低条件。全球定位系统(GPS)在一个广泛的总电子含量数据纬度的地区在40°±地理纬度和一个经度,75°W。找到一个强大的日间电离层响应平流层突然变暖。半日的性格特征,大扰动的振幅和持久性3周后峰值在高纬度地区平流层的温度。扰动通常在低纬度地区开始几天后平流层的高峰温度和观察到的增强赤道电离异常(EIA)早上部门和环评的抑制下午部门。二次增强postsunset小时。一旦在低纬度地区,阶段半日扰动逐步转向当地时间晚些时候在随后的几天。进步转变发生在不同的利率不同的平流层变暖事件。电离层的大小和持久性扰动和可预测性平流层突然变暖好几天进步,目前调查的机会这些现象可能以一种系统化的方式最终导致多日的预测低纬度电离层条件。

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