We investigate the correlation of sporadic E (Es) with the occurrence of medium‐scale traveling ionospheric disturbances (MSTIDs) at night in middle latitudes (25°–40°N and 25°–40°S magnetic latitudes) by examining their occurrence climatology. The occurrence climatology of Es and MSTIDs is derived using the Challenging Minisatellite Payload satellite data acquired in 2001–2008 and 2001–2009, respectively. Electron density irregularities and radio scintillations are used as the detection proxies of MSTIDs and Es, respectively. The occurrence rate of MSTIDs shows a semi‐annual variation with the primary peak during June solstices and the secondary peak during December solstices in both hemispheres. However, the occurrence rate of Es shows a seasonal variation with a pronounced peak in summer in both hemispheres. The occurrence of MSTIDs during local summer and equinoxes is correlated with the occurrence of local Es, but the high occurrence rate of MSTIDs in local winter is not correlated with local winter hemisphere Es. MSTIDs in the winter hemisphere are correlated with magnetically conjugate MSTIDs in the summer hemisphere; these summer hemisphere MSTIDs are correlated with the occurrence of Es in the summer hemisphere. The occurrence rate of MSTIDs clearly shows an increase with decreasing solar activity, but the solar cycle dependence of Es is not obvious from the data. This observation suggests that the generation of MSTIDs is significantly affected by factors other than Es such as the growth rate of the Perkins instability, atmospheric gravity waves, and the F region conductance.

中文翻译：

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CHAMP卫星观测到的夜间MSTID的全球分布及其与E区不规则性的关系

我们通过研究中纬度地区（25°–40°N和25°–40°S磁性纬度）在夜间零星E（Es）与中等规模电离层扰动（MSTIDs）发生之间的相关性。 。利用分别在2001–2008年和2001–2009年获得的具有挑战性的微型卫星有效载荷卫星数据，得出了Es和MSTIDs的发生气候。电子密度不规则和放射闪烁分别用作MSTID和Es的检测代理。MSTIDs的发生率呈半年变化，两个半球的6月至上至主要峰值，12月至次中至次峰值。然而，Es的发生率显示出季节性变化，夏季在两个半球都有明显的峰值。MSTIDs在当地夏季和春分期间的发生与当地Es的发生有关，但是MSTIDs在当地冬季的高发生率与当地冬季的半球Es无关。冬季半球中的MSTID与夏季半球中的磁共轭MSTID相关。这些夏季半球的MSTID与夏季半球Es的发生有关。MSTIDs的发生率清楚地显示出随着太阳活动的减少而增加，但是从数据来看，Es的太阳周期依赖性并不明显。该观察结果表明，MStIDs的产生受到Es以外的其他因素的显着影响，例如Perkins失稳的增长率，大气重力波和地球动力学。但是MSTIDs在当地冬季的高发生率与当地冬季半球Es无关。冬季半球中的MSTID与夏季半球中的磁共轭MSTID相关。这些夏季半球的MSTID与夏季半球Es的发生有关。MSTIDs的发生率清楚地显示出随着太阳活动的减少而增加，但是从数据来看，Es的太阳周期依赖性并不明显。该观察结果表明，MStIDs的产生受到Es以外的其他因素的显着影响，例如Perkins失稳的增长率，大气重力波和地球动力学。但是MSTIDs在当地冬季的高发生率与当地冬季半球Es无关。冬季半球中的MSTID与夏季半球中的磁共轭MSTID相关。这些夏季半球的MSTID与夏季半球Es的发生有关。MSTIDs的发生率清楚地显示出随着太阳活动的减少而增加，但是从数据来看，Es的太阳周期依赖性并不明显。该观察结果表明，MStIDs的产生受到Es以外的其他因素的显着影响，例如Perkins失稳的增长率，大气重力波和地球动力学。这些夏季半球的MSTID与夏季半球Es的发生有关。MSTIDs的发生率清楚地显示出随着太阳活动的减少而增加，但是从数据来看，Es的太阳周期依赖性并不明显。该观察结果表明，MStIDs的产生受到Es以外的其他因素的显着影响，例如Perkins失稳的增长率，大气重力波和地球动力学。这些夏季半球的MSTID与夏季半球Es的发生有关。MSTIDs的发生率清楚地显示出随着太阳活动的减少而增加，但是从数据来看，Es的太阳周期依赖性并不明显。该观察结果表明，MStIDs的产生受到Es以外的其他因素的显着影响，例如Perkins失稳的增长率，大气重力波和地球动力学。F区电导。