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| Wind-oscillation Measurement and Study in Near Space |
| Received:March 13, 2017 Revised:July 15, 2017 |
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| DOI：10.7643/ issn.1672-9242.2017.07.007 |
| KeyWord:near space, tidal, MF radar |
| Author | Institution |
| LI Na |
China Research Institute of Radio-wave Propagation, National Key Laboratory of Electromagnetic Environment, Qingdao, , China |
| CHEN Jin-song |
China Research Institute of Radio-wave Propagation, National Key Laboratory of Electromagnetic Environment, Qingdao, , China |
| DING Zong-hua |
China Research Institute of Radio-wave Propagation, National Key Laboratory of Electromagnetic Environment, Qingdao, , China |
| XU Zheng-wen |
China Research Institute of Radio-wave Propagation, National Key Laboratory of Electromagnetic Environment, Qingdao, , China |
| LIN Le-ke |
China Research Institute of Radio-wave Propagation, National Key Laboratory of Electromagnetic Environment, Qingdao, , China |
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| Abstract: |
| Objective To understand variations of oscillation wind and provide exact environmental status for precision entering and running of aerocraft in near space. Methods The experiments on wind field turbulence were performed at Kunming station (25.6°N, 103.8°E) with Medium frequency radar (MF radar) in the near space observation platform. Based on data on diurnal and semidiurnal tide component and background wind field from Kunming from August 2008 to August 2010 with harmonic fitting method, characteristics of tide fluctuation in 80~100 km of near space in Kunming were analyzed. Results The variations periods of diurnal tide behaved annually and semiannually, although the amplitude of tidal in the first year was larger than that in the second year, which may be thought as quasi-biennial oscillation. The maximum values always occurred in October and March at 86~92 km. But the zonal semidiurnal tidal component has no this feature, at least not obviously. The case became complicated in meridional semidiurnal tidal that annual variation only dominated at 88~94 km region; and several peak values occurred at other height. Conclusion Changes of tide phase show the downward transmission of tide. The height change of tide meets the feature of increasing with height and then decreasing. It shows a cystiform structure. |
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