Studies of ionospheric variations during geomagnetic activities at the low-latitude station, Ile-Ife, Nigeria

Ariyibi, Emmanuel A.; Joshua, E. O.; Rabiu, Babatunde

doi:10.2478/s11600-012-0039-3

Cited by 4 publications

(6 citation statements)

References 16 publications

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“…And this shows that the geomagnetic storm did not have any significant impact on scintillation activity. This observation follows the results of Ariyibi et al (2013a) that the occurrence of geomagnetic storm does not necessarily suggest an increase in the level of scintillation at low-latitude region.…”

Section: Ionospheric Response To the Geomagnetic Storm Of 9 March 2012supporting

confidence: 91%

“…When Bz is strongly negative, magnetic reconnection between the interplanetary magnetic field (IMF) and the geomagnetic field produces open field lines which allow mass, energy, and momentum to be transferred from the solar wind to the Earth's magnetosphere (Davis et al 1997). Some factors determining ionospheric variation during magnetic storm are the alteration of the neutral composition and the thermospheric circulation (Ariyibi et al 2013a).…”

Section: Introductionmentioning

confidence: 99%

“…There are several studies on responses of low latitude ionosphere to magnetic storms events (Sobral et al 1997, Pincheira et al 2002, Abdu 2001, Lobzin and Pavlov 2002aPavlov et al 2004, Lynn et al 2004, Lima et al 2004, Dashora et al 2009, de Siqueira et al 2011, D'ujanga et al 2013. A number of studies by Nigerian researchers have also been conducted on low latitudinal ionosphere responses during magnetic storm periods that have contributed to our understanding on this subject (Adeniyi 1986, Olawepo and Adeniyi 2012, Olawepo 2013, Ariyibi et al 2013a.…”

Section: Introductionmentioning

confidence: 99%

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Investigation of Ionospheric Response to Geomagnetic Storms over a Low Latitude Station, Ile-Ife, Nigeria

2016

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Due to several complexities associated with the equatorial ionosphere, and the significant role which the total electron content (TEC) variability plays in GPS signal transmission, there is the need to monitor irregularities in TEC during storm events. The GPS SCINDA receiver data at Ile-Ife, Nigeria, was analysed with a view to characterizing the ionospheric response to geomagnetic storms on 9 March and 1 October 2012. Presently, positive storm effects, peaks in TEC which were associated with prompt penetration of electric fields and changes in neutral gas composition were observed for the storms. The maximum percentage deviation in TEC of about 120 and 45% were observed for 9 March and 1 October 2012, respectively. An obvious negative percentage TEC deviation subsequent to sudden storm commencement (SSC) was observed and besides a geomagnetic storm does not necessarily suggest a high scintillation intensity (S 4) index. The present results show that magnetic storm events at low latitude regions may have an adverse effect on navigation and communication systems.

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Section: Ionospheric Response To the Geomagnetic Storm Of 9 March 2012supporting

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Investigation of Ionospheric Response to Geomagnetic Storms over a Low Latitude Station, Ile-Ife, Nigeria

2016

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“…Such disturbances translate into perturbations of the charged particles of the ionosphere and can cause detrimental effects on radio-wave signals and satellite communications. These effects have been reported to be more profound at equatorial regions of the earth's ionosphere where large variations in ionospheric parameters have been observed [2,3,4], mainly because of the existence of a ring current flowing in the equatorial plane.…”

Section: Introductionmentioning

confidence: 99%

Geomagnetic Storm Main Phase Effect on the Equatorial Ionosphere over Ile-Ife as measured using GPS Observations

Olabode¹,

Ariyibi²

2019

Preprint

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The effect of the main phase of two intense geomagnetic storm events which occurred on August 5 -6 and September 26 -27, 2011 on the equatorial ionosphere have been investigated using Global Positioning System (GPS) data obtained from an Ile-Ife station (geomagnetic lat. 9.84 • N, long. 77.25 • E, Dip 7.25 • N). Total Electron Content (TEC) profiles during the main phase of the two geomagnetically disturbed days were compared with quiet time average profiles to examine the response of the equatorial ionosphere. The results showed that the intensity of both storm events during the main phase which occurred at nighttime correlated well with a strong southward direction of the z-component of the Interplanetary Magnetic Field (IMF-Bz) and Solar Wind Speed (Vsw), with the Disturbance storm time (Dst) profile showing multiple step development. TEC depletion was observed during the main phase of the August 5 -6, 2011 storm event with TEC recording a maximum value of 9.31 TECU. A maximum TEC value of 55.8 TECU was recorded during the main phase of the September 26 -27, 2011 storm event depicting TEC enhancement. Significant scintillation

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“…In low latitudes, amplitude scintillations and long term fades are a dominant issue, while large phase variations are more in the auroral and polar cap region [5]. [6]. They revealed that the occurrence of scintillations at Ile-Ife station was closely linked to the peak value of TEC during the daytime.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Scintillation Occurrence during Intense Geomagnetic Storms at low latitude stations

Lilian¹,

EA²,

OA³

et al. 2017

PAIJ

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GPS-derived scintillation index 4 S from three low latitude stations located at the Equatorial Ionisation Anomaly (EIA) region has been analysed with a view to knowing the contribution of geomagnetic storms on scintillation occurrence. Results showed that scintillation at low latitude stations was dependent on location, the phase of the storm and time of occurrence of storm. Addis Ababa recorded moderate values of S values ranging from 0.1 to 0.3. Results also revealed that scintillation occurrence during storms can be inhibited or triggered depending on the phase of the storm. Comparative result between scintillation occurrence during storm and that during quiet time showed that scintillation was more pronounced during quiet periods over all stations.

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Studies of ionospheric variations during geomagnetic activities at the low-latitude station, Ile-Ife, Nigeria

Cited by 4 publications

References 16 publications

Investigation of Ionospheric Response to Geomagnetic Storms over a Low Latitude Station, Ile-Ife, Nigeria

Investigation of Ionospheric Response to Geomagnetic Storms over a Low Latitude Station, Ile-Ife, Nigeria

Geomagnetic Storm Main Phase Effect on the Equatorial Ionosphere over Ile-Ife as measured using GPS Observations

Investigation of Scintillation Occurrence during Intense Geomagnetic Storms at low latitude stations

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