Seasonal variation of total electron content at crest of equatorial anomaly station during low solar activity conditions

Mukherjee, Shweta; Sarkar, Shivalika; Purohit, P. K.; Gwal, A. K.

doi:10.1016/j.asr.2010.03.024

Cited by 55 publications

(23 citation statements)

References 14 publications

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“…The IRI-2001 contains a topside formulation based on (Booker 1977) approach of Skeleten profile. This approach has the disadvantage of discrepancies between the experimental and model TEC values during high solar activity years (Mukherjee et al 2010). The IRI-2007 was released with many enhanced features and showed a good agreement with the observed data at the anomaly crest station (Chauhan and Singh 2010 IRI-2001, and IRI01-corr) at different equatorial and low-latitude regions (Watthanasangmechai et al 2012;Wichaipanich et al 2012;Kakinami et al 2012;Okoh et al 2012;Oyekola 2012;Oyekola andFagundes 2012a, 2012b).…”

Section: Introductionsupporting

confidence: 54%

Impacts of solar activity on performance of the IRI-2012 model predictions from low to mid latitudes

2015

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Section: Introductionsupporting

confidence: 54%

Impacts of solar activity on performance of the IRI-2012 model predictions from low to mid latitudes

2015

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“…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: 99%

“…TEC is the number of electrons in the column of 1 m 2 cross section that extends from a GPS satellite to a GPS receiver. This important parameter is a by-product of GPS data, which can also be used to survey the ionosphere and can be used to provide an overall description of the ionosphere (Mukherjee et al, 2010). Bilitza (2001) rightly noted that a good description of the variability in ionospheric magnitudes is a necessary prerequisite for improvement of the performance of the ionospheric models.…”

Section: Introductionmentioning

confidence: 99%

“…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%

“…Bilitza (2001) rightly noted that a good description of the variability in ionospheric magnitudes is a necessary prerequisite for improvement of the performance of the ionospheric models. 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: 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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Magnetic storm effects on the variation of TEC over Ilorin an equatorial station

et al. 2014

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We have used total electron content (TEC) derived from dual-frequency GPS receivers to study magnetically quiet and storm time variations of the ionosphere at Ilorin(8.47°N, 4.68°E), an equatorial station in the African sector. Four years (2009)(2010)(2011)(2012) data were used for the study. The result on the quiet time variation of the ionosphere showed that the diurnal variation of TEC is not symmetrical about noon. This is a departure from a typical Chapman variation. Daytime maximum occurred after local noon (13-16 LT) for all the seasons and at all solar activity levels considered. A significant effect of solar activity variation was observed on the seasonal trend in 2011. The tendency for magnetic storms to cause increases in TEC is much greater than those of decreases. Daytime maximum TEC usually occurred closer to the noon time during storm periods when compared to those of quiet periods. Maximum percent change in TEC on storm days varied from about 25 to 131%.

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Seasonal variation of total electron content at crest of equatorial anomaly station during low solar activity conditions

Cited by 55 publications

References 14 publications

Impacts of solar activity on performance of the IRI-2012 model predictions from low to mid latitudes

Impacts of solar activity on performance of the IRI-2012 model predictions from low to mid latitudes

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

Magnetic storm effects on the variation of TEC over Ilorin an equatorial station

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