Morphology of midlatitude electron density enhancement using total electron content measurements

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題名:	Morphology of midlatitude electron density enhancement using total electron content measurements
作者:	劉正彥;Rajesh, P. K.;Liu, J. Y.;Balan, N.;Lin, C. H.;Sun, Y. Y.;Pulinets, S. A.
貢獻者:	地球科學學院太空科學與工程學系
關鍵詞:	Daytime;Drift;Electron density;electron density enhancement;Electrons;Geomorphology;Geophysics;Ionosphere;Ionospheric electron content;Latitude;Longitude;MEDE;midlatitude ionosphere;Morphology;Night;Plasmasphere;Solar activity;Solar cycle;Solar maximum;Solar minimum;Strength;Total Electron Content;Wind
日期:	2016-02-01
上傳時間:	2026-04-23 11:05:10 (UTC+8)
出版者:	Wiley-Blackwell;Washington: Blackwell Publishing Ltd
摘要:	摘要： Using the global ionospheric map of total electron content in 2002–2009, this paper investigates anomalous, midlatitude electron density enhancement (MEDE) bounded by a tropical electron density trough and the usual midlatitude electron density trough at all times (24 h) of the day for the first time. The diurnal, seasonal, and longitudinal variations in the occurrence and strength of MEDE are studied at solar maximum (2002) and long deep solar minimum (2009), and latitude‐longitude dependence is examined using the data in 2002–2009. The results show that the MEDE occurs at all times of the day though pronounced at night (2200–0400 LT), and in some cases the daytime occurrence could be more frequent than the corresponding nighttime occurrence. The strength maximizes at around 0400 LT and is weak during daytime. Both the occurrence and strength are, in general, predominant in winter at low solar activity and exhibit significant longitudinal dependence. The E × B drift, strength, and direction of neutral wind and ionosphere‐plasmasphere plasma flow and their day‐to‐day variations are suggested to account for the existence of MEDE at all times of the day. Key Points Midlatitude electron density enhancement (MEDE) occurs both daytime and nighttime Global morphology of MEDE reveals significant longitudinal variation E × B drift, neutral wind, and plasma transport could be possible mechanisms 出版者： Washington: Blackwell Publishing Ltd 出版日期： 2016-02 出處： Journal of geophysical research : Space physics (2013 - Present), 2016-02, Vol.121 (2), p.1503-1517 資源來源： Wiley Online Library 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: 10.1002/2015JA022251
顯示於類別:	[太空科學與工程學系] 期刊論文

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