A comparison of lower thermospheric winds derived from range spread and specular meteor trail echoes

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題名:	A comparison of lower thermospheric winds derived from range spread and specular meteor trail echoes
作者:	朱延祥;Li, Guozhu;Ning, Baiqi;Hu, Lianhuan;Chu, Yen-Hsyang;Reid, I. M.;Dolman, B. K.
貢獻者:	太空科學與科技研究中心
關鍵詞:	Atmospheric sciences;Earth sciences;Earth, ocean, space;Exact sciences and technology;Interferometry;lower thermospheric winds;Meteors;Radar;range spread meteor trail echoes;Scientific apparatus & instruments;specular meteor echoes
日期:	2012-01-01
上傳時間:	2026-04-23 11:03:11 (UTC+8)
出版者:	Wiley-Blackwell;Washington, DC: Blackwell Publishing Ltd
摘要:	摘要： Interferometry measurements of range spread meteor trail echoes (RSTEs; also known as nonspecular echoes) have provided new insights into both the irregularity structures in meteor trails and lower‐thermospheric winds (LTWs). In this study, we used trail echoes observed with the newly installed Sanya (18.4°N, 109.6°E) 47.5 MHz VHF coherent radar and the Sanya all‐sky meteor radar to estimate instantaneous zonal and hourly averaged meridional winds from RSTEs and hourly averaged zonal and meridional winds from large numbers of specular meteor echoes. The mean height variations in both the zonal and meridional winds estimated from the RSTEs were generally consistent with those estimated from specular meteor echoes below 96 km. This gives validity to the technique proposed recently by Oppenheim et al. (2009) and suggests that RSTE measurements made with a small radar can be used to investigate LTWs, whereas this had previously been limited to larger radars such as the Jicamarca radar. However, some observations show significant differences in wind magnitude at individual heights at times. The results of RSTE measurements show the presence of an intense westward wind with a speed near 100 ms−1. In contrast, the specular meteor zonal winds were generally less than 50 ms−1. On the other hand, the meridional drift of RSTEs derived from the meridional Doppler velocity at higher altitudes shows a very poor correlation with the specular meteor meridional wind. Potential causes for the discrepancy in wind estimates obtained from RSTE and specular meteor trail echoes are discussed. Key Points The patterns of wind profiles from SEs and RSTEs are generally consistent The zonal wind differences mainly result from the time averaged effect of SEs The RSTEs from the small Sanya radar can be utilized to estimate wind profiles 其他題名： J. Geophys. Res 出版者： Washington, DC: Blackwell Publishing Ltd 出版日期： 2012-03 出處： Journal of Geophysical Research Atmospheres, 2012-03, Vol.117 (A3), p.n/a 資源來源： Wiley Online Journals ** 版權： Copyright 2012 by the American Geophysical Union 版權： 2015 INIST-CNRS 版權： Copyright American Geophysical Union 2012 識別號： ISSN: 0148-0227 識別號： ISSN: 2169-9380 識別號： ISSN: 2156-2202 識別號： EISSN: 2156-2202 識別號： EISSN: 2169-9402 識別號： DOI: 10.1029/2011JA016847
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