Modeling and observations of the low latitude ionosphere-plasmasphere system at long deep solar minimum

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題名:	Modeling and observations of the low latitude ionosphere-plasmasphere system at long deep solar minimum
作者:	劉正彥;Nanan, B.;Chen, C. Y.;Rajesh, P. K.;Liu, J. Y.;Bailey, G. J.
貢獻者:	地球科學學院太空科學與工程學系
關鍵詞:	Atmospheric sciences;deep solar minimum;Earth sciences;Earth, ocean, space;Exact sciences and technology;Ionosphere;Magnetism;plasmasphere;Solar activity
日期:	2012-01-01
上傳時間:	2026-04-23 11:05:03 (UTC+8)
出版者:	Wiley-Blackwell;Washington, DC: Blackwell Publishing Ltd
摘要:	摘要： The behavior of the low latitude ionosphere‐plasmasphere system in American‐Brazilian longitudes (30°W–120°W) in three seasons at the long deep solar minimum (2006–2010) is investigated using the theoretical model SUPIM and FORMOSAT‐3/COSMIC electron density and GIM‐TEC data. The data and model reveal some new aspects primarily for the low solar EUV fluxes. The ionosphere develops as a thin layer in the morning though becomes nearly as strong as that at normal solar minimum at around diurnal maximum (14 LT). However, after sunset the ionosphere‐plasmasphere system decays rapidly to become an extremely weak cold system prior to sunrise (05 LT) when the ionosphere contracts to about 1/3rd as strong as that at normal solar minimum, with peak density only about 1.8 × 105 cm−3, half width only about 150 km, and O+/H+ transition height as low as 475 km where the ion densities are only 104 cm−3 and ion temperatures are only 600 K. The mechanical effects of the neutral wind dominate over other processes, which causes the disappearance of the well known winter anomaly in TEC and Nmax, and lowest O+/H+ transition height (∼650 km at 14 LT and 475 km at 05 LT) occurring at around ±15° magnetic latitudes where the mechanical effects optimize. In addition, the ionosphere becomes weakest about 7 months after the solar activity dipped to the lowest level in 2008. Key Points The ionosphere after sunset contracts to an extremely weak cold thin layer O+/H+; transition height as low as 475 km prior to sunrise Electron‐ion temperatures only 600K prior to sunrise 其他題名： J. Geophys. Res 出版者： Washington, DC: Blackwell Publishing Ltd 出版日期： 2012-08 出處： Journal of Geophysical Research: Space Physics, 2012-08, Vol.117 (A8), p.n/a 資源來源： Wiley Online Library 版權： 2012. American Geophysical Union. All Rights Reserved. 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： EISSN: 2156-2202 識別號： EISSN: 2169-9402 識別號： DOI: 10.1029/2012JA017846
顯示於類別:	[太空科學與工程學系] 期刊論文

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