Dynamical complexity response in Traveling Ionospheric Disturbances across Eastern Africa sector during geomagnetic storms using Neural Network Entropy.

This paper examines the response of dynamical complexity in Traveling Ionospheric Disturbances (TIDs) across Eastern Africa sector during 2015 major geomagnetic storms. Detrended Total Electron Content (DTEC) derived from Eight stations of Global Positioning System (GPS) receivers across Eastern Africa was used to unveil the transient features of dynamical complexity response in TIDs. Neural Network Entropy (NNetEn) was applied to the detrended TEC time series data to capture the degree of dynamical complexity. The NNetEn track the distinct features associated with the occurrence of TIDs. As the signatures of TIDs begin to emerge, we found low values of NNetEn signifying reduction in the degree of dynamical complexity response as TIDs occur while high values of NNetEn were depicted as the signatures of TIDs subsides signifying increase in the dynamical complexity response, as the TIDs signatures begin to subsides. Also, we found that the response of dynamical complexity associated with TIDs features expands from the Southern Hemisphere and diminishes at the Northern Hemisphere. Reduction in dynamical complexity response associated with the occurrence of TIDs is more evident in the Southern Hemisphere compared to Northern Hemisphere indicating that the propagation of TIDs is more prominent in the Southern Hemisphere. Furthermore, we found that the propagation of TIDs is more prominent at Equinoctial season compared to solstitial season. The latitudinal observation of NNetEn revealed higher degree of dynamical complexity response in ADIS and NEGE signifying that the development of TIDs is minimal in ADIS and NEGE.