Lunar-dependent equatorial ionospheric electrodynamic effects during sudden stratospheric warmings
Lunar-dependent equatorial ionospheric electrodynamic effects during sudden stratospheric warmings
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DOI：
10.1029/2010ja015273
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发表时间：
2010-08-28
影响因子：
2.8
通讯作者：
Nagatsuma, T.
中科院分区：
文献类型：
--
作者：
Fejer, B. G.;Olson, M. E.;Nagatsuma, T.
我们使用等离子体漂移和磁场测量在2001-2009年12月至研究，首次，纵向依赖赤道电离层电动扰动在平流层突然变暖。Jicamarca雷达测量在这些事件中显示大白天向下漂移（向西电场）扰动，然后大上午向上和下午向下漂移，系统地转移到当地时间晚。在美洲、印度和太平洋赤道地区的地面磁力计测量显示，在早晨扇区和大的反向电流（即，在北方冬季暖化期间，在接近新月和满月的下午扇区中出现。CHAMP卫星和地面磁场观测表明，这些赤道午后反电急流的发生是经度依赖的。我们的研究结果表明，这些大的电动扰动平流层变暖期间是由于强烈增强的半日月球波的影响。研究结果可用于预测北极冬季变暖期间这些电动扰动的发生和演变。
We have used plasma drift and magnetic field measurements during the 2001-2009 December solstices to study, for the first time, the longitudinal dependence of equatorial ionospheric electrodynamic perturbations during sudden stratospheric warmings. Jicamarca radar measurements during these events show large dayside downward drift (westward electric field) perturbations followed by large morning upward and afternoon downward drifts that systematically shift to later local times. Ground-based magnetometer measurements in the American, Indian, and Pacific equatorial regions show strongly enhanced electrojet currents in the morning sector and large reversed currents (i.e., counterelectrojets) in the afternoon sector with onsets near new and full moons during northern winter warming periods. CHAMP satellite and ground-based magnetic field observations indicate that the onset of these equatorial afternoon counterelectrojets is longitude dependent. Our results indicate that these large electrodynamic perturbations during stratospheric warming periods are due to strongly enhanced semidiurnal lunar wave effects. The results of our study can be used for forecasting the occurrence and evolution of these electrodynamic perturbations during arctic winter warmings.