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Analysis of the instability effect in the sporadic E (Es) layer development over a low latitude station

Authors

Araujo Resende Chagas,  Laysa Cristina
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Zhu,  Yajun
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Denardini,  Clezio M.
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Chagas,  Ronan A. J.
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Da Silva,  Ligia A.
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Figueiredo,  Cosme
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Andrioli,  Vania F.
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Chen,  Sony
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Marchezi,  José
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Moro,  Juliano
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Carrasco,  Jose A.
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Wang,  Chi
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Li,  Hui
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Zhengkuan,  Liu
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

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Citation

Araujo Resende Chagas, L. C., Zhu, Y., Denardini, C. M., Chagas, R. A. J., Da Silva, L. A., Figueiredo, C., Andrioli, V. F., Chen, S., Marchezi, J., Moro, J., Carrasco, J. A., Wang, C., Li, H., Zhengkuan, L. (2023): Analysis of the instability effect in the sporadic E (Es) layer development over a low latitude station, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-1234


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5017403
Abstract
We present a study about the atypical and spreading Sporadic E-layers (Es) using digisonde data. We analyzed a set of days around space weather events from 2016 to 2018 over Cachoeira Paulista (CXP, 22.41°S, 45°W, dip ~35°), a low-latitude Brazilian station. In this region, the inhomogeneous Es layer is associated with the auroral-type (Esa) and occurred due to the South American Magnetic Anomaly (SAMA). However, we also observe that the spreading Es layers occurred days before the magnetic storms, leading us to believe other mechanisms may affect the Es layer development. Thus, our results show evidence that Kelvin-Helmholtz instability (KHI) added to the wind shear mechanism cause such Es layers. We used a numerical model to understand these dynamic processes (MIRE, Portuguese acronym for E Region Ionospheric Model). The results showed that the instability explained these anomalous Es layers and improved the agreement between the model and observational data. Finally, our analysis better understood the Es layer behavior during quiet and disturbed times.