Inter-hourly variability of Total Electron Content during the quiet condition over Nigeria, within the Equatorial Ionization Anomaly region

Ayorinde, Toyese Tunde; Rabiu, Babatunde; Amory‐Mazaudier, Christine

doi:10.1016/j.jastp.2016.04.005

Cited by 16 publications

(12 citation statements)

References 31 publications

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“…Studies on diurnal variation in TEC reveal useful information about the physical processes responsible for the ionospheric behaviour and TEC is fast becoming an impor-tant parameter for both geophysical and engineering applications (Pandey et al, 2001;Mukherjee et al, 2010). In Nigeria, Bolaji et al (2012) reported that during low solar activity the TEC over Ilorin, a station close to the trough of the EIA, exhibits consistent minimum diurnal variation during presunrise hours between 05:00 and 06:00 LT, rises steeply during the sunrise period (07:00-09:00 LT), and subsequently rises very slowly from 10:00 LT to the peak during the daytime, mostly around 12:00-16:00 LT. Bagiya et al (2009) had earlier reported similar diurnal variation patterns during low solar activity periods near the crest region of the EIA in India and confirmed that the diurnal characteristics of TEC depend on season, solar activity, geomagnetic activity, and latitude.…”

Section: Introductionsupporting

confidence: 71%

“…The Ionospheric GPS TEC was obtained from the ground-based GPS receiver stations of NIGNET equipment being operated by the Office of the Surveyor General of the Federation (OSGoF) of Nigeria for the year 2012. Description of the NIGNET network and the managing agency is given in Rabiu et al (2014) and Ayorinde et al (2016).…”

Section: Data and Methods Of Analysismentioning

confidence: 99%

“…The VTEC data estimated are then subjected to a two-sigma (2σ ) iteration, which is a measure of GPS point positioning accuracy (95 % confidence level). Research efforts that have utilized this GPS TEC software include the works of Bolaji et al (2012Bolaji et al ( , 2013, Olwendo et al (2013), Rabiu et al (2014), and Ayorinde et al (2016), among others.…”

Section: Data and Methods Of Analysismentioning

confidence: 99%

“…The seasonal variations in vertical TEC are higher during the equinox than the solstice during low solar activity (Wu et al, 2004;Bagiya et al, 2009;Chauhan et al, 2011) and high solar activity (Natali and Meza, 2011) at different stations.…”

Section: Introductionmentioning

confidence: 98%

“…The variation in ionosphere with time and location on earth necessitates its study at several points on earth for a long time. The equatorial and low-latitude ionosphere manifests a number of unique phenomena, such as the equatorial electrojet (EEJ), equatorial spread F (ESF), equatorial plasma bubble (EPB), and equatorial ionization anomaly (EIA) among others, and is characterized by large transient variations (Bagiya et al, 2009;Mukherjee et al, 2010;Chauhan et al, 2011;Bolaji et al, 2012). The equatorial ionosphere is highly dynamic and consequently poses serious threats to communication and navigation systems (Akala et al, 2010(Akala et al, , 2011(Akala et al, , 2012.…”

Section: Introductionmentioning

confidence: 99%

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Studying the variability in the diurnal and seasonal variations in GPS total electron content over Nigeria

et al. 2017

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Abstract. The study of diurnal and seasonal variations in total electron content (TEC) over Nigeria has been prompted by the recent increase in the number of GPS continuously operating reference stations (CORSs) across Nigeria as well as the reduced costs of microcomputing. The GPS data engaged in this study were recorded in the year 2012 at nine stations in Nigeria located between geomagnetic latitudes -4.33 and 0.72 • N. The GPS data were used to derive GPS TEC, which was analysed for diurnal and seasonal variations. The results obtained were used to produce local GPS TEC maps and bar charts. The derived GPS TEC across all the stations demonstrates consistent minimum diurnal variations during the pre-sunrise hours 04:00 to 06:00 LT, increases with sharp gradient during the sunrise period (∼ 07:00 to 09:00 LT), attains postnoon maximum at about 14:00 LT, and then falls to a minimum just before sunset. Generally, daytime variations are found to be greater than nighttime variations, which range between 0 and 5 TECU. The seasonal variation depicts a semi-annual distribution with higher values (∼ 25-30 TECU) around equinoxes and lower values (∼ 20-25 TECU) around solstices. The December Solstice magnitude is slightly higher than the June Solstice magnitude at all stations, while March Equinox magnitude is also slightly higher than September Equinox magnitude at all stations. Thus, the seasonal variation shows an asymmetry in equinoxes and solstices, with the month of October displaying the highest values of GPS TEC across the latitudes.

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