Vertical ExB drifts from radar and C/NOFS observations in the Indian and Indonesian sectors: Consistency of observations and model
Vertical ExB drifts from radar and C/NOFS observations in the Indian and Indonesian sectors: Consistency of observations and model
复制标题
印度和印度尼西亚地区雷达和 C/NOFS 观测的垂直 ExB 漂移：观测和模型的一致性
DOI：
10.1002/2013ja019732
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发表时间：
2014
期刊：
影响因子：
--
通讯作者：
R. A. Heelis
中科院分区：
文献类型：
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作者：
Patra;A. K.;P. P. Chaitanya;Y. Otsuka;T. Yokoyama;M. Yamamoto;R. A. Stoneback;R. A. Heelis
在本文中，我们分析了垂直ExB漂移获得的多普勒频移的白天150公里雷达回波从两个雷达站位于磁赤道，即Gadanki在印度和Kototabang在印度尼西亚，并将其与C/C上相应的耦合离子中性动力学研究（CINDI）观测结果进行比较。NOFS卫星和Scherliess费耶尔模型，试图了解150 km区域的低纬垂直ExB漂移在多大程度上代表F区域的垂直ExB漂移。雷达观测是在2009年1月、6月、7月和12月的9-16 LT期间进行的。详细的比较表明，在两个位置的雷达观测到的垂直ExB漂移同意CINDI和显着不同的模式。重要的是，当观测到的漂移很大或向下时，模型和观测到的漂移显示出很大的分歧。此外，虽然CINDI以及来自两个卫星的雷达观测结果在平均值上彼此一致，但在一对一的基础上进行比较时，它们在几个场合存在显着差异。详细观察到的差异是由于在与纬度和/或经度差异相关的不同体积中进行的测量，并强调了与两个经度扇区中的潮汐和重力波相关的中性动力学对各自垂直ExB漂移的作用。这里提出的结果是第一次，预计将有更广泛的应用，以进一步了解一般电离层的细尺度纵向变化，特别是印度和印度尼西亚的电离层电动力学。
In this paper, we analyze vertical ExB drifts obtained from the Doppler shifts of the daytime 150 km radar echoes from two radar stations located off the magnetic equator, namely, Gadanki in India and Kototabang in Indonesia, and compare those with corresponding Coupled Ion Neutral Dynamics Investigation (CINDI) observations onboard the C/NOFS satellite and the Scherliess‐Fejer model in an effort to understand to what extent the low‐latitude vertical ExB drifts of the 150 km region represent theFregion vertical ExB drifts. The radar observations were made during 9–16 LT in January, June, July, and December 2009. A detailed comparison reveals that vertical ExB drifts observed by the radars at both locations agree well with those of CINDI and differ remarkably from those of the model. Importantly, the model and observed drifts show large disagreement when the observed drifts are either large or downward. Further, while the CINDI as well as the radar observations from the two longitudes are found to agree with each other on the average, they differ remarkably on several occasions when compared on a one‐to‐one basis. The observed difference in detail is due to measurements made in different volumes linked with latitudinal and/or longitudinal differences and underlines the role of neutral dynamics linked with tides and gravity waves in the two longitude sectors on the respective vertical ExB drifts. The results presented here are the first of their kind and are expected to have wider applications in furthering our understanding on fine‐scale longitudinal variabilities in the ionosphere in general and ionospheric electrodynamics in the Indian and Indonesian sectors in particular.