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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Anomalous behavior of the thermosphere during solar minimum observed by CHAMP and GRACE
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Anomalous behavior of the thermosphere during solar minimum observed by CHAMP and GRACE

机译：热电离层的反常行为太阳活动极小期观察到冠军与优雅

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摘要

High-resolution density observations inferred from accelerometer measurements on the Challenging Mini-Satellite Payload (CHAMP) and Gravity Recovery and Climate Experiment (GRACE) satellites for the period 11-17 December 2008 during the solar minimum are analyzed and compared to reference model predictions. The density distribution as a function of altitude can be studied because the satellites were in the same 8.4/20.4 hour (0824/2024) local solar time plane, CHAMP at a mean altitude of 332 km and GRACE 144 km higher. The mean observed and model density profiles at 476 km reveal considerable differences, which, except for a 25 bias, is not the case at an altitude of 332 km. These differences result from the fact that during this solar minimum the transition from predominantly O to He occurs at a much lower altitude in connection with the winter helium bulge than is predicted by the model. When averaged over the 1 week period, striking wave-3 structures are revealed with respect to longitude that are remarkably consistent between CHAMP and GRACE. We interpret these as the manifestations of nonmigrating tides propagating upward from the lower atmosphere. Comparisons are made with similar data from August 2008, which reveal a wave-4 structure. However, whereas previous results and conventional wisdom would suggest that these features are produced by the eastward propagating diurnal tides with zonal wave numbers s = –2 (DE2) and s = –3 (DE3), respectively, the asymmetries and day-night phase differences that are present suggest the predominance of semidiumal tides SE1 and SE2, respectively, along with the aforementioned diurnal tides as well as tides SW5 and SW6.
机译：高分辨率密度观测推断加速度计测量的挑战性微型卫星有效载荷(冠军)和重力恢复与气候实验(恩)卫星的2008年12月11日至17日这段时间内在分析了太阳相对于参考模型预测。密度分布函数的高度可以学习,因为卫星在吗8.4/20.4小时(0824/2024)地方太阳时相同飞机,冠军在平均海拔332公里优雅144公里高。显示相当大的密度资料在476公里差异,除了25%的偏差,不是在332公里的高度。在这个差异结果的事实太阳从主要的转变他发生在一个更低的高度与冬天氦膨胀比预测的模型。周,wave 3结构显示的经度冠军和优雅之间非常一致。解释这些作为的表现nonmigrating潮汐传播上升的低层大气。类似的数据从2008年8月,揭示了wave-4结构。结果和传统智慧的建议这些特性是由向东传播周日潮汐与纬向波数s = 2(德)和s = 3 (DE3),分别不对称,昼夜相区别目前建议的优势semidiumal潮汐SE1 SE2,分别与上述周日潮汐一样潮汐SW5送回。

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