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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >The midlatitude ionosphere during the total solar eclipse of March 9, 1997
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The midlatitude ionosphere during the total solar eclipse of March 9, 1997

机译：1997年3月9日日全食期间的中纬度电离层

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The total solar eclipse of March 9, 1997, was visible from some regions of China, Mongolia, and East Siberia during 0045-0130 UT. The eclipse coincided with a relatively long geomagnetically quiet period. During the total solar eclipse, the observations included oblique-incidence ionograms recording; also measurement the total electron content along specified directions to the visible Global Positioning System satellites and the Doppler sounding on various HF ray paths over the region under consideration were carried out. This paper presents results derived from studying the spatial pattern of midlatitude ionospheric response to this eclipse on the basis of a numerical simulations. Calculations have been executed using a model for ionosphere-plasmasphere coupling. Comparison of model results with data of all measurements showed a good qualitative and quantitative agreement. It is shown that by and large the behavior of the ionosphere during the eclipse manifests itself as a short-lasting (approx 1-hour) rearrangement to nighttime conditions with the ion flow directed downward from the plasmasphere, as a rise of the F_2 layer maximum by about 20 km, and as a twofold increase in electron density at the height of the maximum during the eclipse's totality phase. The electron temperature decreases by 200-400 K, while the ion temperature drops only slightly. It is found that changes in the spatial distribution of electron density along the HF ray paths during the eclipse give rise to variations of Doppler frequency shift with amplitudes of about 1 Hz and a duration of about 120 min. The findings reported in this paper do not validate the hypothesis that solar eclipses generate atmospheric gravity waves and associated traveling ionospheric disturbances.
机译：0045-0130 UT在中国，蒙古和西伯利亚东部的某些地区可见1997年3月9日的日全食。蚀与相对较长的地磁静默期相吻合。在日全食期间，观测结果包括斜入射电离图记录;还测量了沿指定方向到可见的全球定位系统卫星的总电子含量，并在考虑的区域内的各种HF射线路径上进行了多普勒测深。本文介绍了通过数值模拟研究中纬度电离层对该月食的响应的空间模式而得出的结果。已经使用电离层-等离子层耦合模型执行了计算。模型结果与所有测量数据的比较显示出良好的定性和定量一致性。结果表明，在月食期间电离层的行为总体上表现为对夜间条件的持续时间短（约1小时）重排，其中离子流从等离子层朝下，F_2层最大上升约20 km，并且在日食总体阶段最大高度处电子密度增加了两倍。电子温度降低200-400 K，而离子温度仅轻微降低。已经发现，在日食期间沿HF射线路径的电子密度的空间分布变化会引起多普勒频移的变化，其幅度约为1 Hz，持续时间约为120分钟。本文报道的发现并没有验证日食会产生大气重力波和相关的电离层干扰的假设。

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