Ground-based GPS observation of SED-associated irregularities over CONUS

NCUIR > College of Earth Sciences > DEPARTMENT OF SPACE SCIENCE AND ENGINEERING > journal & Dissertation > Item 987654321/102208

Please use this identifier to cite or link to this item: https://ir.lib.ncu.edu.tw/handle/987654321/102208

Title:	Ground-based GPS observation of SED-associated irregularities over CONUS
Authors:	劉正彥;Sun, Yang-Yi;Matsuo, Tomoko;Araujo-Pradere, Eduardo A.;Liu, Jann-Yenq
Contributors:	地球科學學院太空科學與工程學系
Keywords:	Auroras;data assimilation;Geophysics;Global positioning systems;GPS;irregularity;Kalman filters;Latitude;nonstationary covariance;SED;TEC gradient
Date:	2013-01-01
Issue Date:	2026-04-23 11:04:10 (UTC+8)
Publisher:	Wiley-Blackwell;Washington: Blackwell Publishing Ltd
Abstract:	摘要： It has been known that steep total electron content (TEC) gradients observed at the boundary between the storm‐enhanced plasma density (SED) and the low TEC region at subauroral and midlatitude regions are associated with ionospheric irregularities that impact communication and navigation systems. However, the relationship between the SED‐associated irregularities and TEC gradients is still not well understood, partly because of the difficulties of resolving small‐scale TEC gradients from sparsely distributed TEC observations. In this study, we examine the relationship between the SED‐associated irregularities and TEC gradients during the intense geomagnetic storms of 31 March 2001 and 30 October 2003. To explore this relationship, TEC maps over the continental United States (CONUS) were constructed from ground‐based GPS TEC observations, using Kalman filter update formulae with a recently developed nonstationary wavelet‐based covariance model that enables resolution of TEC structures on both large and finer scales. Our results show that intense TEC gradients and ion drifts are thought to be required conditions for the formation of irregularities on the northeast side of the SED. Additionally, our methodology identified the narrow east‐west stretch of TEC enhancement within the midlatitude low TEC region on 30 October 2003, and this TEC enhancement is most likely to be caused by auroral precipitation. Key Points Deriving TEC maps using a nonstationary covarianceSED-associated large-scale TEC gradients and irregularitiesSmall-scale TEC gradients and irregularities in low TEC region 其他題名： J. Geophys. Res. Space Physics 出版者： Washington: Blackwell Publishing Ltd 出版日期： 2013-05 出處： Journal of geophysical research : Space physics (2013 - Present), 2013-05, Vol.118 (5), p.2478-2489 資源來源： Wiley Online Library - Journals 版權： 2012. American Geophysical Union. All Rights Reserved. 版權： 2013. 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: 10.1029/2012JA018103
Appears in Collections:	[DEPARTMENT OF SPACE SCIENCE AND ENGINEERING] journal & Dissertation

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