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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Climatology of Nighttime Medium-Scale Traveling Ionospheric Disturbances at Mid and Low Latitudes Observed by the DEMETER Satellite in the Topside Ionosphere During the Period 2005–2010
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Climatology of Nighttime Medium-Scale Traveling Ionospheric Disturbances at Mid and Low Latitudes Observed by the DEMETER Satellite in the Topside Ionosphere During the Period 2005–2010

机译：Climatology of Nighttime Medium-Scale Traveling Ionospheric Disturbances at Mid and Low Latitudes Observed by the DEMETER Satellite in the Topside Ionosphere During the Period 2005–2010

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Thermal ion measurements from the French Detection of Electro-Magnetic Emissions Transmitted from Earthquake Regions micro-satellite have been used to study the climatology of nighttime Medium-scale traveling ionospheric disturbances (MSTIDs) in the topside ionosphere at 650 km altitude during the 6 years of the satellite operation, from 2005 to 2010. This period encompasses the declining phase of solar cycle 23, the deep solar minimum of 2008–2009 and the early rise of solar cycle 24. MSTIDs were detected from the quasi-periodic variations of the density of the dominant ionospheric O~+ ions. Mostly present between ~15° and ~40° invariant latitudes with a small number of events in equatorial regions, the MSTIDs exhibit, on the average, larger occurrence rates in the Southern hemisphere with a peak in the Eastern Pacific-South America longitude sector. The dependence of MSTID activity on solar activity appears more complex than the previously reported simple anti-correlation. In addition to year-to-year variations, our study has, in particular, put in evidence a noticeable hemispheric asymmetry in the seasonal variations during the deep solar minimum of 2008–2009. These statistical observations provide a remarkable observational support to the key role of sporadic Es layers and the conjugate mapping of the associated electric fields. Yet, improved theoretical and numerical models, taking into account the actual inter-hemispheric differences of the seasonal and solar activity variations of thermospheric and ionospheric processes, are needed for a better understanding of the highly complex MSTID phenomena.
机译：热离子测量从法国检测电磁排放的传播地震地区卫星已经被使用研究夜间的气候学中等规模的旅行电离层扰动在上部电离层(MSTIDs) 650公里高度在6年的卫星操作,从2005年到2010年。包括太阳活动周期的下降阶段23日的太阳活动极小期,2008 - 2009年太阳活动周期的早期上升24。检测到的准周期性的变化占主导地位的电离层O ~ +离子的密度。~ 15°~ 40°之间大多存在不变的纬度与少量的事件赤道地区,MSTIDs展览,一般来说,更大的发生率在南部半球峰值在东部美国Pacific-South经度部门。在太阳活动MSTID活动的依赖看起来比之前报道的更复杂简单的anti-correlation。年际变化,我们的研究特别地,放在一个明显的证据半球不对称的季节性变化在2008 - 2009年的太阳活动极小期。统计观测提供了一个非凡的观察支持零星的关键作用Es层的共轭映射电场有关。理论和数值模型,结合脑半球账户的实际差异的季节性和太阳活动的变化thermospheric和电离层的过程更好地了解所需的高度复杂MSTID现象。

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