New modes and mechanisms of thermospheric mass density variations from GRACE accelerometers

doi:10.1002/2016JA022594

	New modes and mechanisms of thermospheric mass density variations from GRACE accelerometers
	Calabia, Andres 1,2; Jin, Shuanggen 1
刊名	JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
	2016-11-01
卷号	121 期号:11 页码:11191-11211
ISSN号	2169-9380
DOI	10.1002/2016JA022594
通讯作者	Jin, Shuanggen(sgjin@shao.ac.cn)
英文摘要	Monitoring and understanding the upper atmosphere processes is important for orbital decay and space physics. Nowadays, Low Earth Orbit (LEO) accelerometers provide a unique opportunity to study thermospheric density variations with unprecedented details. In this paper, thermospheric mass densities variations from Gravity Recovery and Climate Experiment (GRACE) accelerometers are investigated for the period 2003-2016 using the principal component analysis (PCA). The resulting modes are analyzed and parameterized in terms of solar and magnetospheric forcing, local solar time (LST), and annual variations. A better understanding of global thermospheric air density variations is presented, which validates the suitability of our technique and model. The parameterization of the subsolar-point annual variation shows two maxima around June and only one in December. The LST parameterization shows a new fluctuation controlling a middle latitude four-wave pattern, with two maxima at 12 h and 21 h LST and two minima at 1 h and 17 h LST. Our parameterizations are suitable to represent small-scale variations including, e.g., the equatorial mass density anomaly (EMA) and the midnight density maximum (MDM). Finally, the residuals are analyzed in the spectral domain, and additional contributions are found at the frequencies of the radiational tides and at the periods of 83, 93, 152, and 431 days.
WOS关键词	CHAMP OBSERVATIONS ; GEOMAGNETIC STORM ; SOLAR ; MAXIMUM
WOS研究方向	Astronomy & Astrophysics
语种	英语
出版者	AMER GEOPHYSICAL UNION
WOS记录号	WOS:000390403400038
内容类型	期刊论文
源URL	[http://libir.pmo.ac.cn/handle/332002/23383]
专题	中国科学院紫金山天文台
通讯作者	Jin, Shuanggen
作者单位	1.Chinese Acad Sci, Shanghai Astron Observ, Key Lab Planetary Sci, Shanghai, Peoples R China 2.Univ Chinese Acad Sci, Beijing, Peoples R China
推荐引用方式 GB/T 7714	Calabia, Andres,Jin, Shuanggen. New modes and mechanisms of thermospheric mass density variations from GRACE accelerometers[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS,2016,121(11):11191-11211.
APA	Calabia, Andres,&Jin, Shuanggen.(2016).New modes and mechanisms of thermospheric mass density variations from GRACE accelerometers.JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS,121(11),11191-11211.
MLA	Calabia, Andres,et al."New modes and mechanisms of thermospheric mass density variations from GRACE accelerometers".JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS 121.11(2016):11191-11211.