Low solar activity variability and IRI 2007 predictability of equatorial Africa GPS TEC

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dc.contributor.authorAdewale, A.O.
dc.contributor.authorE.O. Oyeyemi, E.O.
dc.contributor.authorCilliers, P.J.
dc.contributor.authorMcKinnell, L.A.
dc.contributor.authorAdeloye, A.B.
dc.date.accessioned2019-08-26T14:29:46Z
dc.date.available2019-08-26T14:29:46Z
dc.date.issued2011
dc.description.abstractDiurnal, seasonal and latitudinal variations of Vertical Total Electron Content (VTEC) over the equatorial region of the African continent and a comparison with IRI-2007 derived TEC (IRI-TEC), using all three options (namely; NeQuick, IRI01-corr and IRI-2001), are presented in this paper. The variability and comparison are presented for 2009, a year of low solar activity, using data from thirteen Global Positioning System (GPS) receivers. VTEC values were grouped into four seasons namely March Equinox (February, March, April), June Solstice (May, June, July), September Equinox (August, September, October), and December Solstice (November, December, January). VTEC generally increases from 06h00 LT and reaches its maximum value at approximately 15h00–17h00 LT during all seasons and at all locations. The NeQuick and IRI01-corr options of the IRI model predict reasonably well the observed diurnal and seasonal variation patterns of VTEC values. However, the IRI-2001 option gave a relatively poor prediction when compared with the other options. The post-midnight and post-sunset deviations between modeled and observed VTEC could arise because NmF2 or the shape of the electron density profile, or both, are not well predicted by the model; hence some improvements are still required in order to obtain improved predictions of TEC over the equatorial region of the Africa sector.en_US
dc.identifier.citationAdewale, A.O., Oyeyemi, E.O., Cilliers, P.J., McKinnell, L.A., Adeloye, A.B. Low Solar Activity Variability and IRI 2007 predictability of Equatorial Africa GPS TEC. Adv. Space Res. 49, 316–326, 2012en_US
dc.identifier.urihttps://ir.unilag.edu.ng/handle/123456789/4772
dc.language.isoenen_US
dc.publisherElsevier Ltden_US
dc.subjectTotal Electron Content (TEC)en_US
dc.subjectIRIen_US
dc.subjectIRI variabilityen_US
dc.subjectGPSen_US
dc.titleLow solar activity variability and IRI 2007 predictability of equatorial Africa GPS TECen_US
dc.typeArticleen_US
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