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Thermosphere-Ionosphere Coupling in the Equatorial and Low Latitude Regions: Optical and Radio-wave Observations

Authors

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

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

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

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

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

Nyassor,  Prosper K.
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

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

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

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

Sampaio,  Antonio H. R.
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

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Citation

Takahashi, H., Figueiredo, C. A. O. B., Essien, P., Wrasse, C. M., Barros, D., Nyassor, P. K., Paulino, I., Egito, F., Rosa, G. M., Sampaio, A. H. R. (2023): Thermosphere-Ionosphere Coupling in the Equatorial and Low Latitude Regions: Optical and Radio-wave Observations, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-3685


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5020857
Abstract
Equatorial thermosphere-ionosphere has several singular processes: Equatorial Ionization Anomaly (EIA), F-layer Pre-reversal enhancement (PRE), Equatorial Plasma Bubbles (EPBs) and Midnight Temperature Maximum (MTM). All these processes are related to interaction of the thermospheric winds and ionospheric plasma. Over the South American continent, we are observing dynamical processes of the atmosphere by multi-instrumental means, optical airglow imager, ionosonde, GNSS receiver network, together with available satellite data. In some cases, we observed large scale gravity waves propagating in the MLT region (80-100 km altitudes), then a few hours later we observed a similar wave structure propagating in the ionosphere. Investigating characteristics of the two waves we found that these waves have their origin in the troposphere where a deep convection spot was going on. Also found that detrended total electron content (TEC) map indicated a concentric wave structure in the ionosphere. However, the center of the concentric wave did not coincide with the convection spot, indicating that this concentric wave is not a primary wave but a secondary generated wave. The other phenomenon of interaction of thermosphere-ionosphere is Midnight Temperature Maximum (MTM) and plasma bubbles. We, some occasions, observed OI 630 nm enhancement inside the bubble when the MTM passed over the bubbles. This interaction must be related to coupling of the thermospheric winds and plasma bubbles. In this talk, we present observational evidence of these coupling processes and to discuss the source and propagation mechanism.