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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Discussion papers
https://doi.org/10.5194/angeo-2019-55
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/angeo-2019-55
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Regular paper 29 Apr 2019

Regular paper | 29 Apr 2019

Review status
This discussion paper is a preprint. A revision of this manuscript was accepted for the journal Annales Geophysicae (ANGEO) and is expected to appear here in due course.

Identifying possible Stratification phenomenon in ionospheric F2 Layer using the data observed by the Demeter satellite: Method and Results

Xiuying Wang, Dehe Yang, Dapeng Liu, and Wei Chu Xiuying Wang et al.
  • Institute of Crustal Dynamics, China Earthquake Administration, Beijing, China

Abstract. Many studies have revealed the stratification phenomenon of the topside ionospheric F2 layer using ground-based or satellite-based ionograms, which can show direct signs of this phenomenon. However, it is difficult to identify this phenomenon using the satellite-based in situ electron density data. Therefore, a statistical method, using the shuffle resampling skill, is adopted in this paper. For the first time, in situ electron density data, recorded by the same Langmuir probe onboard the Demeter satellite at different altitudes, are analyzed and a possible stratification phenomenon is identified using the proposed method. Our results show that the nighttime stratification, possibly a permanent phenomenon, can cover most longitudes near the geomagnetic equator, which is not found from the daytime data. The arch-like nighttime stratification decreases slowly on the summer hemisphere and thus extends a larger latitudinal distance from the geomagnetic equator. All results, obtained by the proposed method, indicate that the stratification phenomenon is more complex than what has previously been found. The proposed method thus is an effective one, which can also be used on similar studies of comparing fluctuated data.

Xiuying Wang et al.
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Xiuying Wang et al.
Xiuying Wang et al.
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Short summary
To check the difference between data observed at different altitudes of the Demeter satellite, a statistical method is adopted to evaluate whether data difference is caused by normal data fluctuation or by altitude adjustment. Based on the method, the in situ electron density data at higher altitude are found to be greater than that at lower altitude. We speculate this phenomenon is caused by stratification above F2 peak region. The proposed method is useful when comparing fluctuated data.
To check the difference between data observed at different altitudes of the Demeter satellite, a...
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