Total electron content (TEC) seasonal variability under fluctuating activity, from 2000 to 2002, at Niamey station

Zoundi, Christian; Bazié, Nongobsom; Ouattara, Frédéric

doi:10.5897/ijps2021.4960

Cited by 5 publications

(3 citation statements)

References 12 publications

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“…Picanço et al [8] observed the same result by highlighting that EPB-related TEC perturbations tend to be higher (or lower respectively) when solar activity is high (or low respectively). Zoundi et al [21] also obtained a correlation between TEC variations and solar activity by analyzing Niamey station (lat. : 13˚28'N; long: 2˚10'E) TEC variability during fluctuating activities (FA).…”

Section: Introductionmentioning

confidence: 98%

TEC Variability during Fluctuating Events at Koudougou Station during Solar Cycle 24

Pahima¹,

Gnabahou²,

Sandwidi³

et al. 2022

IJG

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This paper deals with TEC variability during fluctuating geomagnetic events (FE) during solar cycle 24 at Koudougou station (lat: 12˚15'N; Geo long: −2˚20'E). The study was done by comparing TEC variations during FE days with those of quiet days (QA). Comparison was made taking into account solar phases' and seasons' influences. FE's and QA's TEC curves are characterized by dome profiles. All graphs show two troughs, one in the morning (0500 LT) and the second in the evening (around 2000 LT) and a peak around 1400 LT during all solar phases and winter months and around 1500 LT for the remaining seasons. Both troughs are caused by the decrease of the photo ionization and an increase of the recombination phenomena, as well for FE as for QA periods. FE cause positive storms during all solar phases as well as during seasons and some negative storms during spring and summer months and minimum and maximum solar phases.

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Section: Introductionmentioning

confidence: 98%

TEC Variability during Fluctuating Events at Koudougou Station during Solar Cycle 24

Pahima¹,

Gnabahou²,

Sandwidi³

et al. 2022

IJG

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“…Sethia et al (1980) and Balan and Iyer (1983) have shown that the electrojet has a pronounced influence on the development of EIA in TEC based on the sparse data of previous satellites of opportunity. Balan et al, (1994), Ouattara et al, (2009), Akala et al, (2013), Ayorinde et al, (2016), Ratovsky et al, (2022, Zoundi et al, (2021), have examined the dynamic of the ionosphere and its characteristics at all latitudes during different phases of the solar cycle under disturbed and quiet conditions. Some of them have highlighted the fact that the variability depends on the level of sun agitation, the season and the geomagnetic activity.…”

Section: Introductionmentioning

confidence: 99%

Diurnal and seasonal variation of GPS-TEC during a low solar activity period at EIA region (Bhopal)

Pal,

Trivedi,

Jain

et al. 2024

The Scientific Temper

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The ionosphere near the equatorial ionization anomaly crest region in the Indian ionospheric sector was studied from May 2016 to April 2017, a solar minimum period. Total electron content (TEC) recorded using the multiple frequency GPS receivers at Bhopal (23.2° N, 77.4° E & MLAT 14.2° N) is used for the study. The diurnal variation shows that the day minimum in TEC is attained around 06:00 hours LT, and the day maximum occurs at about 16:00 hours LT. A similar diurnal pattern was observed in all months across various seasons. During the period of study, it was observed that Seasonal variation of TEC was minimal in winter, whereas highest during equinox and summer months. The variation of TECmax with EEJ shows a positive correlation between the parameters for all the months. The highest correlation (0.8398) was observed in January 2017, while it was lowest (0.4004) in March 2017 and the results were compared with earlier observations, and a possible mechanism was discussed.

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“…Many studies have examined the dynamic of the ionosphere and its characteristics at all latitudes during different phases of the solar cycle under disturbed and quiet conditions. Some of them have highlighted the fact that the variability depends on the level of Sun agitation, the season and the geomagnetic activity [1]- [6]. The seasonal variations of the Total Electron Content in the regions of equatorial anomalies are the combined effects of the neutral transequatorial, sub-solar and towards the equator [7] [8].…”

Section: Introductionmentioning

confidence: 99%

Total Electron Content Diurnal and Seasonal Variations and Response to Solar Events at Koudougou Station in Burkina Faso

Sawadogo,

Kaboré,

Koala

et al. 2023

IJG

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In this paper, we studied the seasonal behavior of the total electron content (TEC) during a part of solar cycle 24 ascending, maximum and decreasing phases at Koudougou station (Latitude: 12˚15'09"N Longitude: 2˚21'45"W). Response of TEC to solar recurrent events is presented. The highest values of the TEC in 2014, 2015 and 2016 were recorded on March and October, while in 2013 they were recorded on April and November, corresponding to equinox months. This observation shows that TEC values at the equinoxes are higher than those of solstices. Moreover, the monthly TEC varies in phase with the sunspots number showing a linear dependence of the TEC on solar activity. The ionospheric electron contents are generally very low both before noon and during the night, but quite high at noon and after noon. This pattern of TEC variation is due to the fluctuation of incident solar radiation on the Earth's equatorial ionosphere. During quiet periods, the number of free electrons generated is lower than that generated during recurrent periods, which shows a positive contribution of recurrent activity to the level of the TEC. Investigations have also highlighted a winter anomaly and equinoctial asymmetry in TEC behavior at Koudougou station.

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Total electron content (TEC) seasonal variability under fluctuating activity, from 2000 to 2002, at Niamey station

Cited by 5 publications

References 12 publications

TEC Variability during Fluctuating Events at Koudougou Station during Solar Cycle 24

TEC Variability during Fluctuating Events at Koudougou Station during Solar Cycle 24

Diurnal and seasonal variation of GPS-TEC during a low solar activity period at EIA region (Bhopal)

Total Electron Content Diurnal and Seasonal Variations and Response to Solar Events at Koudougou Station in Burkina Faso

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