A new approach to the derivation of dynamic information from ionosonde measurements

A new approach to the derivation of dynamic information from ionosonde measurements
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从电离探空仪测量中获取动态信息的新方法

DOI:
10.5194/angeo-21-2185-2003
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发表时间:
2003-11
期刊:
Ann. Geophys.
影响因子:
--
通讯作者:
J. Lei
J. Lei
中科院分区:
其他
文献类型:
--
作者:
L. Liu;X. Luan;W. Wan;B. Ning;J. Lei

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发展了一种从电离层探空仪测量数据中提取电离层F层峰值附近动态信息的新方法。这种方法避免了从观测峰值高度与无风平衡高度的位移来推算等效风,因此不需要像传统的伺服理论那样确定可能限制推算风精度的无风平衡高度。通过与Fabry-Perot干涉仪、Millstone Hill非相干散射雷达的测量结果以及前人工作的比较,初步验证了该方法的有效性。利用武汉DGS-256型数字探空仪资料,计算了2000年12月武汉(114.4 E,30.6 N,45.2°)等效风垂直分量的个例。在冬季,即使在低磁活动的条件下,推导出的VEWS也显示出很大的逐日变化。平均风速的日变化规律比经验水平风模式(HWM)预测的要复杂得多。利用基于Jicamara雷达和卫星观测的经验电场模式,研究了中性风和F层峰电场对大气环流的贡献。在此期间,如果电场模式对武汉的贡献是合理的,则中性风对风速的贡献最大,而E◊B漂移的贡献不大。
A new approach is developed to derive dynamic information near the peak of the ionospheric F-layer from ionosonde measurements. This approach avoids deducing equivalent winds from the displacement of the observed peak height from a no-wind equilibrium height, so it need not de- termine the no-wind equilibrium height which may limit the accuracy of the deduced winds, as did the traditional servo theory. This approach is preliminarily validated with com- parisons of deduced equivalent winds with the measurements from the Fabry-Perot interferometer, the Millstone Hill inco- herent scatter radar and with previous works. Examples of vertical components of equivalent winds (VEWs), over Wuhan (114.4 E, 30.6 N, 45.2 dip), China in December 2000 are derived from Wuhan DGS-256 Digisonde data. The deduced VEWs show large day-to-day variations during the winter, even in low magnetic activity conditions. The diurnal pattern of average VEWs is more complicated than that predicted by the empirical Horizontal Wind Model (HWM). Using an empirical electric field model based on the observations from Jicamarca radar and satel- lites, we investigate the contributions to VEWs from neutral winds and from electric fields at the F-layer peak. If the elec- tric field model is reasonable for Wuhan during this period, the neutral winds contribute mostly to the VEWs, and the contribution from the E ◊ B drifts is insignificant.
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