TEC derived from some GPS stations in Nigeria and comparison with the IRI and NeQuick models

Rabiu, Babatunde; Adewale, A.O.; Abdulrahim, R. B.; Oyeyemi, E. O.

doi:10.1016/j.asr.2014.02.009

Cited by 32 publications

(22 citation statements)

References 22 publications

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“…Eyelade et al: Variability in the diurnal and seasonal variations in GPS TEC March Equinox, followed by September Equinox, December Solstice, and June Solstice. Earlier on, a similar semi-annual variation was observed in TEC by Bolaji et al (2013) and Rabiu et al (2014) while working at stations within Nigeria. The semi-annual variation in Fig.…”

Section: Seasonal Variation In Gps Total Electron Contentmentioning

confidence: 65%

“…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 diurnal variations in GPS TEC in all stations in Nigeria show characteristics typical of the low-latitude ionosphere (e.g. Rama Rao et al, 2006a, b andRabiu et al, 2014). It is clearly shown from the plots that TEC exhibits consistent minimum diurnal variation during the pre-sunrise hours 04:00 to 05:00 LT with magnitude of 0 to 5 TECU, rises steeply during the sunrise period (07:00 to 09:00 LT), and then rises very slowly from 10:00 LT with the intensity of the sun to an afternoon maximum between 12:00 and 16:00 LT.…”

Section: Diurnal Variation In Total Electron Content Of the Ionosphermentioning

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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Section: Seasonal Variation In Gps Total Electron Contentmentioning

confidence: 65%

Section: Data and Methods Of Analysismentioning

confidence: 99%

Section: Data and Methods Of Analysismentioning

confidence: 99%

Section: Diurnal Variation In Total Electron Content Of the Ionosphermentioning

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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“…The ionospheric effect on GPS signals thus provides information necessary for understanding of temporal and spatial variations of the ionosphere and its effects on navigation. Many researchers have also worked on variation of TEC using GPS data (Wu et al, 2008a Rama Rao, 2006bolaji et al 2012and Rabiu et al 2014. Rama Rao 2006 have studied the spatial and temporal variations of the equatorial ionosphere, in Indian Sector during the low solar activity period of 2004-2005.…”

Section: Introductionmentioning

confidence: 99%

The trend of ionospheric total electron content near the equator

Shehu¹,

Sa’id²,

Okoro³

2018

Bayero J. Pure App. Sci.

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The Ionospheric Total Electron Content (TEC) data measured simultaneously by analyzing dual-frequency signals of the Global Position System (GPS) in two northern Nigeria equatorial stations: Ahmadu Bello University Zaria (ABUZ) with geographic latitude (11.16° N) and Longitude(7.65° E) and Birnin Kebbi Polytechnic (BKFP) with geographic latitude(12.46° N) and Longitude(4.20°E) during the year 2012 (R z =57.58) was used to study the diurnal, monthly and seasonal variation of equatorial ionosphere. The result shows that the mean TEC varies from a minimum at 0600 hrs LT to a peak value at about 1500 to 1700 hrs LT and then decreases. The seasonal variation in TEC maximizes during the equinox months followed by winter and is minimum during the summer months.

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2012

Space Weather Quarterly

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As readers of Space Weather already know, solar-terrestrial research is important for the design and operation of a large number of critical technical systems important for civil and national security interests. This is prominent in the latest decadal survey of the field by an expert committee under the auspices of the National Research Council (http://www.nap. edu/catalog.php?record_id=13060). The second decadal survey of this research field (the first was conducted in 2002) devotes almost two full chapters to the relevance and importance of the applications of solar-terrestrial research to practical applications. The challenges for predicting and understanding the solar-terrestrial environment are addressed in a full chapter devoted to societal needs. The opening to this chapter, "Societal aspirations for a secure, prosperous, and technologically sophisticated future are increasing influenced by Earth's nearspace environment," is one of the best onesentence summaries that I have encountered supporting a need for deep understanding of the space environment around planet Earth. I would agree with the chapter's statement that "[s]cience cannot now reliably predict, with sufficient warning, the disturbances from space that may threaten society at any particular time." Models and observations are increasing in sophistication. However, many aspects of the coupled system from a solar active region to, for example, a specific ionosphere location where enhanced currents can distort GPS signals, are highly complex and presently unpredictable. Indeed, I once wrote that I considered this example to be one of the "grand challenges in understanding the natural hazards of space weather" (http:// w w w.agu.org/journals/sw/swa /editorial/ article/?id=2009SW000522). Other examples of solar-terrestrial unpredictability and the impacts on technical systems of various types are briefly discussed in the chapter. The report designates the second applications chapter as "Vision for Space Weather and Climatology," discussing policy imperatives and ending with an envisioned space weather and climate program. Such a program, as out-lined, would engage collaboratively and substantively the major federal agencies (NASA, NOAA, the National Science Foundation, the Department of Defense (DOD), and the Department of Energy) as well as the growing commercial sector. Major policy issues arise from the discussions in these two chapters, issues that are then addressed by two focused and strong recommendations. The first recommendation, a major one, is that because of its critical national importance at the federal level, the National Space Weather Program (NSWP) should be rechartered under the auspices of the National Science and Technology Council (http:// www.whitehouse.gov/administration/eop/ ostp/nstc). Such a rechartering would be successful only if the Office of Science and Technology Policy and the Office of Management and Budget were active participants; such collaboration constitutes a part of this recommendation. Implementation of this c...

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TEC derived from some GPS stations in Nigeria and comparison with the IRI and NeQuick models

Cited by 32 publications

References 22 publications

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

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

The trend of ionospheric total electron content near the equator

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