Features of the middle- and low-latitude ionosphere during solar minimum as revealed from COSMIC radio occultation measurements

	Features of the middle- and low-latitude ionosphere during solar minimum as revealed from COSMIC radio occultation measurements
	Liu, Libo; Le, Huijun; Chen, Yiding; He, Maosheng; Wan, Weixing; Yue, Xinan
刊名	JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
	2011
卷号	116 页码:A09307
ISSN号	2169-9380
通讯作者	Liu, LB (reprint author), Chinese Acad Sci, Inst Geol & Geophys, Beijing Natl Observ Space Environm, Beijing 100029, Peoples R China.
中文摘要	In this study, the ionospheric electron density profiles retrieved from radio occultation measurements of the Constellation Observing System for Meteorology, Ionosphere and Climate (COSMIC) mission are analyzed to determine the F-2 layer maximum electron density (NmF2), peak height (h(m)F(2)), and Chapman scale height (H-m). During the deep solar minimum of 2008-2009, NmF2, h(m)F(2), and H-m show complicated seasonal variations, which are generally consistent with those in previous solar minima. Besides the equinoctial asymmetry, nonseasonal and semiannual anomalies are present in daytime NmF2; the Weddell Sea anomaly appears in nighttime NmF2 in all seasons except the June solstice. Unusually higher values of h(m)F(2) and H-m appear at southern middle latitudes in the region centered at 70 degrees E in the daytime and h(m)F(2) at 70 degrees W in the nighttime. Wave-like longitudinal patterns are evidently present at low latitudes in all three parameters, showing diurnal and seasonal nature. The values of the parameters under study are smaller in 2008-2009 than the rest of the COSMIC period examined in this study. The seasonal and latitudinal pattern of daytime NmF2 on the solar sensitivity not only confirms our earlier investigation but also explains the observed small NmF2 in 2008-2009 in response to the reduced solar extreme ultraviolet radiance.
英文摘要	In this study, the ionospheric electron density profiles retrieved from radio occultation measurements of the Constellation Observing System for Meteorology, Ionosphere and Climate (COSMIC) mission are analyzed to determine the F-2 layer maximum electron density (NmF2), peak height (h(m)F(2)), and Chapman scale height (H-m). During the deep solar minimum of 2008-2009, NmF2, h(m)F(2), and H-m show complicated seasonal variations, which are generally consistent with those in previous solar minima. Besides the equinoctial asymmetry, nonseasonal and semiannual anomalies are present in daytime NmF2; the Weddell Sea anomaly appears in nighttime NmF2 in all seasons except the June solstice. Unusually higher values of h(m)F(2) and H-m appear at southern middle latitudes in the region centered at 70 degrees E in the daytime and h(m)F(2) at 70 degrees W in the nighttime. Wave-like longitudinal patterns are evidently present at low latitudes in all three parameters, showing diurnal and seasonal nature. The values of the parameters under study are smaller in 2008-2009 than the rest of the COSMIC period examined in this study. The seasonal and latitudinal pattern of daytime NmF2 on the solar sensitivity not only confirms our earlier investigation but also explains the observed small NmF2 in 2008-2009 in response to the reduced solar extreme ultraviolet radiance.
学科主题	空间物理
收录类别	SCI
资助信息	National Natural Science Foundation of China [40725014, 41074112]; China Meteorology Administration [GYHY201106011]; Specialized Research Fund for State Key Laboratories; U.S. Air Force; National Science Foundation [AGS-0918398/CSA AGS-0961147]
语种	英语
公开日期	2014-12-15
内容类型	期刊论文
源URL	[http://ir.nssc.ac.cn/handle/122/3209]
专题	国家空间科学中心_空间科学部
推荐引用方式 GB/T 7714	Liu, Libo,Le, Huijun,Chen, Yiding,et al. Features of the middle- and low-latitude ionosphere during solar minimum as revealed from COSMIC radio occultation measurements[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS,2011,116:A09307.
APA	Liu, Libo,Le, Huijun,Chen, Yiding,He, Maosheng,Wan, Weixing,&Yue, Xinan.(2011).Features of the middle- and low-latitude ionosphere during solar minimum as revealed from COSMIC radio occultation measurements.JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS,116,A09307.
MLA	Liu, Libo,et al."Features of the middle- and low-latitude ionosphere during solar minimum as revealed from COSMIC radio occultation measurements".JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS 116(2011):A09307.