Modelling ionospheric vertical drifts over Africa low latitudes using Empirical Orthogonal functions and comparison with climatological model |
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Authors: | Makhosonke Berthwell Dubazane John Bosco Habarulema Jean Claude Uwamahoro |
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Institution: | South African Space Agency (SANSA) Space Science, Hermanus 7200, South Africa;Department of Physics and Electronics, Rhodes University, South Africa |
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Abstract: | For the first time, empirical model of daytime vertical drift based on Empirical Orthogonal functions (EOF) decomposition technique is presented. Day-to-day variability of drift inferred from horizontal (H) geomagnetic field data around dip latitude for the period of 2008–2013 is used to both develop and validate the model. Results show that the EOF technique is promising with modelled values and data giving correlation coefficient values of at least 0.90 for geomagnetic conditions of both and within 2008–2013. Independent model validation shows that in situ values from ion velocity meter (IVM) instrument on-board C/NOFS satellite are closer to model estimates than the climatological Scherliess-Fejer (SF) model incorporated within the International Reference Ionosphere (IRI). |
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Keywords: | Low latitude ionosphere Empirical Orthogonal functions |
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