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SCIENTIFIC JOURNALS
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Issues: 244 Articles: 2812

Vol 56, No 5 (2013)
by 13th of January, 2014

Magnetic storm effect on the occurrence of ionospheric irregularities at an equatorial station in the African sector


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Abstract in English

Large-scale ionospheric irregularities usually measured by GPS TEC fluctuation indices are regular occurrence at the equatorial region shortly after sunset around solar maximum. Magnetic storm can trigger or inhibit the generation of these irregularities depending on the local time the main phase of a particular storm occurs. We studied the effect of nine (9) distinct storms on the occurrence of ionospheric irregularities at Fraceville in Gabon (Lat = −1.63˚, Long = 13.55˚, dip lat. = −15.94˚), an equatorial station in the African sector. These storms occurred between November 2001 and September 2002. We used TEC fluctuation indices (i.e. ROTI and ROTIAVE) estimated from 30 s interval Rinex data and also we used the storm indices (i.e. Dst, dDst/dt, and IMF BZ) to predict the likely effect of each storm on the irregularities occurrence at this station. The results obtained showed that most of the storms studied inhibited ionospheric irregularities. Only one out of all the storms studied (i.e. September 4, 2002 storms with the main phase on the night of September 7-8) triggered post-midnight ionospheric irregularities. There are two of the storms during which ionospheric irregularities were observed. However, these may not be solely attributed to the storms event because the level of irregularities observed during these two storms is comparable to that observed during previous days before the storms. For this station and for the storms investigated, it seems like a little modification to the use of Aarons categories in terms of the local time the maximum negative Dst occurs could lead to a better prediction. However, it would require investigating many storms during different level of solar activities and at different latitudes to generalize this modification.

Language
English
Subject

Equatorial ionosphere Ionospheric irregularities TEC (Total Electron Content) ROT (Rate of Change of TEC) Magnetic storm

Type
Atmospheric Physics and Chemistry
Firstpage Number
A0565
Keywords

Equatorial ionosphere; Ionospheric irregularities; TEC (Total Electron Content); ROT (Rate of Change of TEC); Magnetic storm

Date of issue
Volume
56
Issue
5
Category
Cite
MIA

Olushola Abel Oladipo, et al. "Magnetic storm effect on the occurrence of ionospheric irregularities at an equatorial station in the African sector" Annals of Geophysics 56.5 (2014): A0565.


Harvard

Olushola Abel Oladipo, Torben Schüler, 2014. Magnetic storm effect on the occurrence of ionospheric irregularities at an equatorial station in the African sector. Annals of Geophysics, 56(5), pp.A0565.


Chicago

Olushola Abel Oladipo, Torben Schüler. "Magnetic storm effect on the occurrence of ionospheric irregularities at an equatorial station in the African sector." Annals of Geophysics 56, no. 5 (2014): A0565.


ДСТУ 2006

Olushola Abel Oladipo, Torben Schüler. Magnetic storm effect on the occurrence of ionospheric irregularities at an equatorial station in the African sector / Olushola Abel Oladipo, Torben Schüler // Annals of Geophysics. - 2014. Vol. 56. - № 5. - pp. A0565.


ГОСТ 2008

Olushola Abel Oladipo, Torben Schüler. Magnetic storm effect on the occurrence of ionospheric irregularities at an equatorial station in the African sector // Annals of Geophysics. 2014. № 5 (56). С. A0565.


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