Comparison of foE and M(3000)F2 variability at Ibadan, Singapore and Slough

Somoye, E.O.; Onori, Eugene; Akala, A. O.

doi:10.1016/j.jastp.2012.09.014

Cited by 6 publications

(2 citation statements)

References 24 publications

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“…The files were unzipped and further processed using the CRX2RNX Hatanaka and Gopi or GPS_TEC developed by Dr Gopi Seemala of Boston College in Texas [19] Mean vTEC (in TEC units of 10 16 el/m 2 ) during the four seasons at both stations for all hours of the day were plotted against each hour of the day. Also, variability of vTEC is evaluated from the hourly mean (μ) of vTEC and its corresponding standard deviation (σ) by using the approach of [15], [18], [6], [22], [23], [24].…”

Section: Methodsmentioning

confidence: 99%

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Analyses of Total Electron Content Variations Over Northern and Southern Nigeria

Ogwala

2017

JRRS

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Total electron content (TEC) is a parameter of the ionosphere that produces great effect on radio signals. We present the diurnal and seasonal variations of vertical total electron content (vTEC) during the ascending phase of solar cycle 24. A moderate solar activity year (2011) with sunspot number, Rz = 55.7 is used in this study. Total electron content (TEC) deduced from the dual frequency GPS measurements obtained at two ground stations namely: ABUZ (Zaria) with longitude 7.39oE in the north and UNEC (Enugu) with longitude 7.30oE in the south are considered. Both stations are located within the same longitude and has a latitudinal difference of 4.74o in the Nigerian equatorial ionosphere (NEI). Comparison of diurnal and seasonal variations of TEC is carried out for both stations. The diurnal variation of TEC shows a steep increase starting from sunrise, reaching daytime maximum between 13 – 15 LT at UNEC and 14 – 16 LT at ABUZ, then falls to a minimum at sunset. Dawn depression occurred at the same local time of 04 LT at both stations. On a seasonal scale, Pre- and post-midnight values were highest during the Equinoxes, followed by December solstice and least in June Solstice season at ABUZ. Pre- and post-midnight values were also higher during the Equinoxes than the Solstice season at UNEC, although they are about the same range. Also, TEC values are observed to be slightly higher for all hours and seasons at Enugu in the south than Zaria in the north except during March equinox at Zaria where TEC values were higher during the daytime. This implies that there could be little variations in TEC even within the same latitudinal zone.

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Section: Methodsmentioning

confidence: 99%

“…(%) = × 100 (8) This method of determining variability shows that the deviation of all daily values from the monthly mean (or median) is considered. This indicates that the whole data is used [22], [23]. Analyses of vTEC variability will also be considered on diurnal and seasonal scales.…”

Section: Methodsmentioning

confidence: 99%