Ionospheric Time-delay over Akure Using Global Positioning System Observations

Ionospheric time delay ( V Δ t ) variability using Global Positioning System (GPS) data over Akure (7.15°N, 5.12°E), Nigeria, has been studied. The observed variability of V Δ t in comparison to older results of vertical total electron content (TEC) across similar regions has shown equivalent signat...

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Bibliographic Details
Published in:	Acta geophysica Vol. 63; no. 3; pp. 884 - 899
Main Authors:	Bolaji, Olawale S., Izang, Patrick A., Oladosu, Olakunle R., Koya, Femi, Fayose, Rufus S., Rabiu, Akeem B.
Format:	Journal Article
Language:	English
Published:	Cham Springer International Publishing 01-06-2015 De Gruyter Open Springer Nature B.V
Subjects:	Earth and Environmental Science Earth Sciences Electrons Geophysics/Geodesy Geotechnical Engineering & Applied Earth Sciences Global Positioning System Global positioning systems GPS Ionosphere Structural Geology time delay total electron content Nigeria time delay ionosphere total electron content Global Positioning System
Online Access:	Get full text
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Summary:	Ionospheric time delay ( V Δ t ) variability using Global Positioning System (GPS) data over Akure (7.15°N, 5.12°E), Nigeria, has been studied. The observed variability of V Δ t in comparison to older results of vertical total electron content (TEC) across similar regions has shown equivalent signatures. Higher monthly mean values of V Δ t ( MV Δ t ) were observed during daytime as compared to nighttime (pre- and post-midnight) hours in all months. The highest MV Δ t observed in September during daytime hours range between ~6 and ~21 ns (~1.80 and ~6.30 m) and at post-midnight, they are in the range of ~1 to ~6 ns (~0.3 to ~1.80 m). The possible mechanisms responsible for this variability were discussed. Seasonal V Δ t were investigated as well.
ISSN:	1895-6572 1895-7455
DOI:	10.1515/acgeo-2015-0018