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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >An evidence for prompt electric field disturbance driven by changes in the solar wind density under northward IMF B_z condition
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An evidence for prompt electric field disturbance driven by changes in the solar wind density under northward IMF B_z condition

机译：一个证据提示电场干扰由太阳风密度下的变化国际货币基金组织(IMF)向北说是条件

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摘要

Before the onset of a geomagnetic storm on 22 January 2012 (Ap =24), an enhancement in solar wind number density from 10/cm~3 to 22/cm~3 during 0440–0510 UT under northward interplanetary magnetic field (IMF B_z) condition is shown to have enhanced the high-latitude ionospheric convection and also caused variations in the geomagnetic field globally. Conspicuous changes in ΔX are observed not only at longitudinally separated low-latitude stations over Indian (prenoon), South American (midnight), Japanese (afternoon), Pacific (afternoon) and African (morning) sectors but also at latitudinally separated stations located over high and middle latitudes. The latitudinal variation of the amplitude of the ΔX during 0440–0510 UT is shown to be consistent with the characteristics of prompt penetration electric field disturbances. Most importantly, the density pulse event caused enhancements in the equatorial electrojet strength and the peak height of the F layer (h_mF_2) over the Indian dip equatorial sector. Further, the concomitant enhancements in electrojet current and F layer movement over the dip equator observed during this space weather event suggest a common driver of prompt electric field disturbance at this time. Such simultaneous variations are found to be absent during magnetically quiet days. In absence of significant change in solar wind velocity and magnetospheric substorm activity, these observations point toward perceptible prompt electric field disturbance over the dip equator driven by the overcompression of the magnetosphere by solar wind density enhancement.
机译：22日发病前地磁风暴2012年1月(美联社= 24),太阳能的增强风从10数密度/厘米~ 3 - 22 /厘米~ 3向北0440 - 0510 UT行星际磁场(IMF说是)条件显示有增强了高纬度地区电离层对流,还导致的变化全球在地磁场。ΔX的变化不仅观察到纵向分离低纬度站在印度(prenoon),南美(午夜),日本(下午),太平洋(下午)非洲(早上)部门还在纬向车站位于分开高、中纬度地区。ΔX的振幅的变化0440 - 0510 UT显示一致的特点促使电渗透场干扰。脉冲事件导致赤道增强电喷流强度和峰高的F层(h_mF_2)在印度赤道部门。电喷流电流和电离层运动在这空间天气磁赤道观察事件显示提示的常见驱动电动磁场干扰。期间发现没有变化磁安静的日子。太阳风速度和显著的变化磁层亚暴活动,这些观察指向明显的提示在磁赤道电场干扰过压缩的驱动磁气圈通过太阳风密度的提高。

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