Quasi two day wave-related variability in the background dynamics and composition of the mesosphere/thermosphere and the ionosphere

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Title:	Quasi two day wave-related variability in the background dynamics and composition of the mesosphere/thermosphere and the ionosphere
Authors:	張起維;Chang, Loren C.;Yue, Jia;Wang, Wenbin;Wu, Qian;Meier, R. R.
Contributors:	地球科學學院太空科學與工程學系
Keywords:	Astrophysics;Broadband;Composition;Coupling;Density ratio;Dissipation;Dynamics;Interferometers;Ionosphere;Ionospheric electron content;Latitude;Lower thermosphere;Mesosphere;Meteorology;Planetary waves;quasi two day wave;Stratosphere;Thermosphere;Total Electron Content;Turbopause;Ultraviolet imagery;Variability;Wind;Zonal winds
Date:	2014-01-01
Issue Date:	2026-04-23 11:05:45 (UTC+8)
Publisher:	Wiley-Blackwell;United States: Blackwell Publishing Ltd
Abstract:	摘要： AbstractDissipating planetary waves in the mesosphere/lower thermosphere (MLT) region may cause changes in the background dynamics of that region, subsequently driving variability throughout the broader thermosphere/ionosphere system via mixing due to the induced circulation changes. We report the results of case studies examining the possibility of such coupling during the northern winter in the context of the quasi two day wave (QTDW)—a planetary wave that recurrently grows to large amplitudes from the summer MLT during the postsolstice period. Six distinct QTDW events between 2003 and 2011 are identified in the MLT using Sounding of the Atmosphere using Broadband Emission Radiometry temperature observations. Concurrent changes to the background zonal winds, zonal mean column O/N2 density ratio, and ionospheric total electron content (TEC) are examined using data sets from Thermosphere Ionosphere Mesosphere Energetics and Dynamics Doppler Interferometer, Global Ultraviolet Imager, and Global Ionospheric Maps, respectively. We find that in the 5–10 days following a QTDW event, the background zonal winds in the MLT show patterns of eastward and westward anomalies in the low and middle latitudes consistent with past modeling studies on QTDW‐induced mean wind forcing, both below and at turbopause altitudes. This is accompanied by potentially related decreases in zonal mean thermospheric column O/N2, as well as to low‐latitude TECs. The recurrent nature of the above changes during the six QTDW events examined point to an avenue for vertical coupling via background dynamics and chemistry of the thermosphere/ionosphere not previously observed. 其他題名： J. Geophys. Res. Space Physics 出版者： United States: Blackwell Publishing Ltd 出版日期： 2014-06 出處： Journal of Geophysical Research: Space Physics, 2014-06, Vol.119 (6), p.4786-4804 資源來源： Wiley Online Library All Journals 版權： 2014. The Authors. 版權： 2014. American Geophysical Union. All Rights Reserved. 版權： 2014. The Authors. 2014 識別號： ISSN: 2169-9380 識別號： ISSN: 2169-9402 識別號： EISSN: 2169-9402 識別號： DOI: 10.1002/2014JA019936 識別號： PMID: 26312201
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