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Your search keyword '"Abe, Oladipo E."' showing total 7 results
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7 results on '"Abe, Oladipo E."'

2. Regional Spatial Mean of Ionospheric Irregularities Based on K-Means Clustering of ROTI Maps.

Author

Migoya-Orué, Yenca, Abe, Oladipo E., and Radicella, Sandro

Subjects
*IONOSPHERIC plasma, *K-means clustering, *MACHINE learning, *MATHEMATICAL optimization, *LONGITUDE
Abstract

In this paper, we investigate and propose the application of an unsupervised machine learning clustering method to characterize the spatial and temporal distribution of ionospheric plasma irregularities over the Western African equatorial region. The ordinary Kriging algorithm was used to interpolate the rate of change of the total electron content (TEC) index (ROTI) over gridded 0.5° by 0.5° latitude and longitude regional maps in order to simulate the level of ionospheric plasma irregularities in a quasi-real-time scenario. K-means was used to obtain a spatial mean index through an optimal stratification of regional post-processed ROTI maps. The results obtained could be adapted by appropriate K-means algorithms to a real-time scenario, as has been performed for other applications. This method could allow us to monitor plasma irregularities in real time over the African region and, therefore, lead to the possibility of mitigating their effects on satellite-based location systems in the said region. [ABSTRACT FROM AUTHOR]

Published
2024
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7. Southern European ionospheric TEC maps based on Kriging technique to monitor ionosphere behavior

Author

Rodríguez Bouza, Marta, Paparini, Claudia, Otero, Xurso, Herraiz, M., Radicella, S. M., Abe, Oladipo E., Rodríguez Caderot, Gracia, Rodríguez Bouza, Marta, Paparini, Claudia, Otero, Xurso, Herraiz, M., Radicella, S. M., Abe, Oladipo E., and Rodríguez Caderot, Gracia

Abstract

Global or regional Maps of the ionospheric Total Electron Content (TEC) are an efficient tool to monitor the delay introduced by the ionosphere in the satellite signals. Ionospheric disturbance periods are of particular interest because these conditions can strongly affect satellite navigation range measurements. This work presents post-processing regional vertical TEC maps over Southern Europe ([35 degrees N-50 degrees N] latitude) obtained by applying Kriging interpolation to GPS derived TEC over more than 100 Global Navigation Satellite System (GNSS) stations. These maps are used to study the behavior of the ionosphere during space weather events and their effects. To validate these maps, hereafter called Southern European Ionospheric Maps (SEIMs), their TEC values have been compared with those obtained from EGNOS Message Server (EMS) and with direct experimental TEC data from GNSS stations. Ionospheric space weather events related to geomagnetic storms of March 17th, 2013, February 19th, 2014 and March 17th, 2015 have been selected. To test the methodology, one period of quiet days has been also analyzed. TEC values obtained by SEIMs in the Ionospheric Grid Points (IGPs) defined by EGNOS are very close to those given by EMS and in the period of major geomagnetic storms the difference does not exceed 6 TEC units. These results confirm the good performance of the technique used for obtaining the SEIMs that can be a useful tool to study the ionosphere behavior during geomagnetic storms and their effects in the region of interest., Ministerio de Economía y Competitividad (MINECO), Unidad Deptal. de Astronomía y Geodesia, Fac. de Ciencias Matemáticas, TRUE, pub

Published
2017

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