...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Longitudinal variations in the equatorial vertical drift in the topside ionosphere
【24h】

Longitudinal variations in the equatorial vertical drift in the topside ionosphere

机译：在赤道的垂直纵向变化在上部电离层漂移

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The vertical ion drift is important for understanding and modeling the electrodynamics at low latitudes. Measurements from the ion drift meter on the Defense Meteorological Satellite Program (DMSP) F15 are used to examine longitudinal variations in the vertical ion drift at the dip equator in the topside ionosphere. Local time was restricted to 0930 and the data were organized by month for 2001 and 2002. Two features were found contributing to the longitudinal variations in the electrodynamics. Meridional winds contribute to the equatorial vertical ion drift at the 830 km magnetic apex due to their dynamo action at the foot points of the magnetic field lines in the F region at magnetic latitudes near 15°. Electric fields producing a downward perturbation drift at 0930 are produced by hemispheric differences in the dynamo current due primarily to the different orientation of the magnetic meridian relative to the terminator. This produces the seasonally dependent variation as a function of longitude that is observed. A wavenumber-4 longitudinal variation also appears to be present throughout the year but is more influential during equinox conditions. This variation also shows a seasonal cycle, shifting east during northern summer and west during northern winter. Further analysis would be required to isolate the characteristics of a wavenumber-4 driver from the wavenumber-4 component of the Fourier series used here to fit the data.
机译：垂直离子漂移是很重要的理解和建模的电动力学低纬度地区。计在国防气象卫星程序(DMSP) F15用于检查纵向垂直离子漂移的变化在上部的磁赤道电离层。当地时间限制在0930年,该数据被月组织2001年和2002年。功能被发现导致纵向变化的电动力学。经向风导致赤道垂直离子漂移在磁顶830公里由于电机动作的脚点F地区的磁场线磁纬度15°附近。产生一个向下的扰动漂移,享年0930岁是由半球差异发电机电流主要原因是不同的相对磁子午线的方向《终结者》。相关的经度变化的函数这是观察到的。变异似乎也在场但在equinox更具影响力条件。周期,将在夏天北部和东部西方在北方的冬天。需要隔离的特点从wavenumber-4 wavenumber-4的司机组件使用的傅里叶级数来配合数据。

著录项

相似文献

  • 外文文献
  • 中文文献
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号