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Discussion papers
https://doi.org/10.5194/angeo-2019-78
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/angeo-2019-78
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: regular paper 05 Jun 2019

Submitted as: regular paper | 05 Jun 2019

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This discussion paper is a preprint. It is a manuscript under review for the journal Annales Geophysicae (ANGEO).

Solar-cycle, seasonal, and asymmetric dependencies of thermospheric mass density disturbances due to magnetospheric forcing

Andres Calabia and Shuanggen Jin Andres Calabia and Shuanggen Jin
  • School of Remote Sensing and Geomatics Engineering, Nanjing University of Information Science and Technology, Nanjing 210044, China

Abstract. Short-term upper atmosphere variations due to magnetospheric forcing are very complex, and neither well understood nor capably modelled due to limited observations. In this paper, mass density variations from 2003–2013 of GRACE observations are isolated through the parameterization of annual, Local-Solar-Time (LST), and solar-cycle fluctuations using a Principal Component Analysis (PCA) technique and investigated in terms of magnetospheric drivers. The magnitude of high-frequency (< 10 days) disturbances shows unexpected dependencies on solar-cycle, seasonal, and an asymmetric behaviour based on weaker variations in June at the South Polar Region (SPR). We suspect this seasonal modulation might be related to the Russell-McPherron (R-M) effect, and find a similar pattern, but less pronounced at the northern and equatorial regions. A possible cause of this latitudinal asymmetry might be the irregular shape of Earth’s magnetic field (with the north dip pole close to Earth’s rotation axis, and the south dip pole far from that axis). After accounting for solar-cycle and seasonal dependencies by regression analysis to the magnitude of the high-frequency perturbations, the parameterization in terms of Dst shows good correlation, while Am and Em are best predictors. We test several mass density models, including JB2008, NRLMSISE-00, and TIEGCM, and find that they are unable to completely reproduce the seasonal and solar-cycle trends found in this study, and with a clear overestimation of about 100 % during low solar activity periods.

Andres Calabia and Shuanggen Jin
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Andres Calabia and Shuanggen Jin
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Supporting Information for "Solar-cycle, seasonal, and asymmetric dependencies of thermospheric mass density disturbances due to magnetospheric forcing" A. Calabia and S. Jin https://doi.org/10.5281/zenodo.3234582

Andres Calabia and Shuanggen Jin
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Short summary
Atmospheric drag due to mass density distribution, particularly during storm-time, is of great importance for Low Earth Orbit Precise Orbit Determination, and for the understanding of Magnetosphere-Ionosphere-Thermosphere phenomena. In this paper, we investigate solar-cycle, seasonal, and hemispheric asymmetry dependencies of thermospheric mass density disturbances due to magnetospheric forcing, from 10-year (2003–2013) continuous time-series of GRACE estimates.
Atmospheric drag due to mass density distribution, particularly during storm-time, is of great...
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