New modes and mechanisms of thermospheric mass density variations from GRACE accelerometers | |
Calabia, Andres1,2; Jin, Shuanggen2 | |
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 |
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://119.78.226.72/handle/331011/32669] |
专题 | 中国科学院上海天文台 |
通讯作者 | Jin, Shuanggen |
作者单位 | 1.Univ Chinese Acad Sci, Beijing, Peoples R China 2.Chinese Acad Sci, Shanghai Astron Observ, Key Lab Planetary Sci, Shanghai, 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. |
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