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| Gravity Wave in Near Space by Falling-sphere Detection |
| Received:December 28, 2018 Revised:June 25, 2019 |
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| DOI：10.7643/ issn.1672-9242.2019.06.004 |
| KeyWord:near space falling-sphere detection gravity wave vertical wavelength |
| Author | Institution |
| SHENG Zheng |
1. College of Meteorology and Oceanology, National University of Defense Technology, Nanjing , China |
| ZHOU Shu-dao |
1. College of Meteorology and Oceanology, National University of Defense Technology, Nanjing , China |
| GE Wei |
1. College of Meteorology and Oceanology, National University of Defense Technology, Nanjing , China |
| WEI Ke-jing |
1. College of Meteorology and Oceanology, National University of Defense Technology, Nanjing , China |
| YING Yang-tao |
2. Unit 91867, PLA, Ningbo , China |
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| Abstract: |
| Objective To research the strength of falling-sphere detection to gravity wave in the near space. Methods The maximum entropy method was used to extract vertical wavelength of dominant gravity wave based on the horizontal winds profiles calculated with the falling sphere position information obtained through radar tracking during the first falling-sphere experiment in China. Meanwhile, the maximum entropy method and S transform were also used to obtain the corresponding gravity wave parameters based on temperature profile measured at the corresponding time and position by the TIMED/SABER satellite. The gravity wave parameters obtained through two methods were compared. Results The wind field disturbance profile and the temperature disturbance profile were analyzed with the maximum entropy. It was found that the vertical wavelength of main gravity wave was about 4 km (zonal wind) 6.5 km (meridional wind) and 12 km (temp) respectively. The vertical wavelength obtained by S-transform from temp profile was concentrated at 10-12 km. It meant that the different gravity wave of wind field profile and temperature profile was mainly caused by insufficient resolution of satellite detection data. Conclusion Compared with the temperature profile, the wind field profile data detected rocket has more resolution ratio of gravity wave. It could recognize smaller and finer structure of vertical wavelength. The rocket falling-sphere detection is more precise. |
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