• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Surveys in Geophysics: An International Review Journal of Geophysics and Planetary Sciences >Thermospheric Meridional Wind Control on Equatorial Scintillations and the Role of the Evening F-Region Height Rise, E × B Drift Velocities and F2-Peak Density Gradients
【24h】

Thermospheric Meridional Wind Control on Equatorial Scintillations and the Role of the Evening F-Region Height Rise, E × B Drift Velocities and F2-Peak Density Gradients

机译：赤道闪烁的热圈子午风控制以及晚上F区域高度上升，E×B漂移速度和F2峰值密度梯度的作用

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 possible role, on L-band scintillation activity, played by the nighttime magnetic meridional component of the thermospheric horizontal neutral winds, the post-sunset F-layer base height, the electrical field pre-reversal enhancement (PRE) and the latitudinal gradients of the F2-layer peak density is analyzed, considering different cases of scintillation occurrence (and their latitudinal extent) during August and September 2002. The meridional winds were derived over low-latitudes from a modified form of the nonlinear time-dependent servo-model. A chain of two scintillation monitors and three digital ionosondes was operational in Brazil and used to collect, respectively, global positioning system signal amplitude scintillation and ionospheric height (h′F; hpF2) and frequency (foF2) parameters. From the overall behavior in the 2 months analyzed, the results suggest that high near sunset upward vertical plasma drifts are conducive for the generation of spread-F irregularities, whereas large poleward meridional winds tend to suppress the development of plasma bubble irregularities and the occurrence of their associated scintillations. Even when generated, a reduced fountain effect, due to weak electric field PRE, acts for the bubbles to be expanded less effectively to higher latitudes. The results also reveal that high F-layer base and peak heights (at equatorial and off-equatorial latitudes), and intense gradients in the F2-peak density between the dip equator and the equatorial anomaly crests, are favorable conditions for the generation of F-region irregularities and increased scintillation activity. Other distinct features of the controlling factors in the cases of occurrence and non-occurrence of equatorial scintillations are presented and discussed.
机译：热球水平中性风的夜间磁子午分量，日落后F层基高，电场逆转增强（PRE）和纬向纬度梯度对L波段闪烁活动的可能作用考虑到2002年8月和2002年9月发生闪烁的不同情况（及其纬度范围），分析了F2层的峰值密度。子午线风是从非线性修正的随时间变化的伺服模型的形式在低纬度上得出的。在巴西运行了由两个闪烁监测器和三个数字离子探空仪组成的链，用于分别收集全球定位系统信号幅度闪烁和电离层高度（h'F; hpF2）和频率（foF2）参数。从所分析的2个月的总体行为来看，结果表明，较高的近日落上升垂直等离子体漂移有利于产生展布F不规则现象，而较大的极向子午风往往会抑制等离子气泡不规则现象的发生和抑制。他们相关的闪烁。即使当产生时，由于弱的电场PRE，减小的喷泉效应也会使气泡不太有效地膨胀到较高的纬度。结果还表明，较高的F层底峰高度和峰高（在赤道和赤道纬度），以及在赤道和赤道异常波峰之间的F2峰密度的强烈梯度是产生F的有利条件。 -区域不规则和闪烁活动增加。提出并讨论了在发生和不发生赤道闪烁情况下控制因素的其他独特特征。

著录项

相似文献

  • 外文文献
  • 专利
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