Tests of electrodynamic consistency from daytime ionospheric drift observations
Tests of electrodynamic consistency from daytime ionospheric drift observations
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白天电离层漂移观测的电动一致性测试
DOI：
10.1029/ja082i016p02413
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发表时间：
1977
影响因子：
--
通讯作者：
J. V. Evans
中科院分区：
文献类型：
--
作者：
J. Salah;J. V. Evans
利用Millstone Hill（42.6 ° N）非相干散射雷达，在地磁平静条件下，对电离层E区和F区的日间偏频离子漂移速度的观测表明，漂移方向存在着一个具有半日周期的顺时针旋转，E区漂移的方位角滞后于F区漂移50 ° ~ 60 °。F区水平离子漂移是由于电离层极化电场的存在，而在E区高度，离子还被中性风驱动。通过使用从F区域漂移确定的电场，可以从E区域漂移导出关于中性风的信息。这样得到的风被认为是在适当的高度平均的潮汐风在低热层对应的（2，4）传播模式。该模式已独立于Millstone Hill的温度测量结果进行了识别。相反，E区离子漂移的计算结果的（2，4）潮汐风和观察到的电场的组合再现的所有功能的观察。最后，发电机区域的电流已经从更多的实验数据中计算出来，并显示出在地面产生的磁场变化与中纬度观测到的平均Sq变化相似，表明我们的观测结果总体上是一致的。«少
Observations of the daytime horizonal ion drift velocity in the ionospheric E and F regions by the incoherent scatter radar at Millstone Hill (42.6degreeN) during quiet geomagnetic conditions reveal the presence of a clockwise rotation of the drift direction with a semidiurnal period and a lag in the azimuth of the E region drift of 50degree--60degree behind the F region drift. The F region horizonatal ion drifts result from the presence of ionospheric polarization electric fields, while at E region heights the ions are additionally driven by neutral winds. By using the electric fields determined from the F region drifts it is possible to derive information on the neutral winds from the E region drifts. The winds so obtained are found to be in good agreement with appropriately height averaged tidal winds in the lower thermosphere corresponding primarily to the (2,4) propagating mode. This mode has been identified independently from temperature measurements at Millstone Hill. Conversely, calculations for the E region ion drift as a consequence of the combination of the (2,4) tidal winds and the observed electric fields are shown to reproduce all features of the observations. Finally, the electric currents in the dynamo region have been computed frommore » these experimental data and are shown to produce a magnetic variation at the ground that is similar to the observed average Sq variation at mid-latitudes, indicating the overall consistency of our observations.« less