Coherent seasonal, annual, and quasi-biennial variations in ionospheric tidal/SPW amplitudes

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题名:	Coherent seasonal, annual, and quasi-biennial variations in ionospheric tidal/SPW amplitudes
作者:	張起維;Chang, Loren C.;Sun, Yan‐Yi;Yue, Jia;Wang, Jack Chieh;Chien, Shih‐Han
贡献者:	地球科學學院太空科學與工程學系
关键词:	Biennial variations;Coherence;Constellation Observing System for Meteorology, Ionosphere and Climate;Constellations;Density ratio;Equatorial ionization anomaly;Hilbert transformation;Hilbert‐Huang transform;Ionization;Ionosphere;Ionospheric tides;Ionospherics;Irradiance;Latitude;Maximization;MEEMD;Meteorology;Optimization;Planetary waves;QBO;Quasi-biennial oscillation;Quasi-biennial variations;Signatures;Solar cycle;Solar cycles;Solar irradiance;Solar maximum;Solar minimum;Stratosphere;Thermosphere;Tides;Total Electron Content;Troughs;Ultraviolet imagery;Variability
日期:	2016-07-01
上传时间:	2026-04-23 11:03:26 (UTC+8)
出版者:	Wiley-Blackwell;Washington: American Geophysical Union (AGU)
摘要:	摘要： AbstractIn this study, we examine the coherent spatial and temporal modes dominating the variation of selected ionospheric tidal and stationary planetary wave (SPW) signatures from 2007 to 2013 FORMOSAT‐3/COSMIC (Constellation Observing System for Meteorology, Ionosphere, and Climate) total electron content observations using multidimensional ensemble empirical mode decomposition (MEEMD) from the Hilbert‐Huang Transform. We examine the DW1, SW2, DE3, and SPW4 components, which are driven by a variety of in situ and vertical coupling sources. The intrinsic mode functions (IMFs) resolved by MEEMD analysis allows for the isolation of the dominant modes of variability for prominent ionospheric tidal/SPW signatures in a manner not previously used, allowing the effects of specific drivers to be examined individually. The time scales of the individual IMFs isolated for all tidal/SPW signatures correspond to a semiannual variation at equatorial ionization anomaly (EIA) latitudes maximizing at the equinoxes, as well as annual oscillations at the EIA crests and troughs. All tidal/SPW signatures show one IMF isolating an ionospheric quasi‐biennial oscillation (QBO) in the equatorial latitudes maximizing around January of odd‐numbered years. This total electron content QBO variation is in phase with a similar QBO variation isolated in both the Global Ultraviolet Imager (GUVI) zonal mean column O/N2 density ratio (ΣO/N2) and the F10.7 solar radio flux index around solar maximum, while showing temporal variation more similar to that of GUVI ΣO/N2 during the time around the 2008/2009 extended solar minimum. These results point to both quasi‐biennial variations in solar irradiance and thermosphere/ionosphere composition as a generation mechanism for the ionospheric QBO. 出版者： Washington: American Geophysical Union (AGU) 出版日期： 2016-07 出處： Journal of Geophysical Research: Space Physics, 2016-07, Vol.121 (7), p.6970-6985 資源來源： Wiley Online Library - AutoHoldings Journals 版權： 2016. American Geophysical Union. All Rights Reserved. 識別號： ISSN: 2169-9380 識別號： ISSN: 2169-9402 識別號： EISSN: 2169-9402 識別號： DOI: 10.1002/2015ja022249
显示于类别:	[太空科學與工程學系] 期刊論文

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