International Journal of
Physical Sciences

  • Abbreviation: Int. J. Phys. Sci.
  • Language: English
  • ISSN: 1992-1950
  • DOI: 10.5897/IJPS
  • Start Year: 2006
  • Published Articles: 2572

Full Length Research Paper

foF2 diurnal variation at Dakar station during the period of geomagnetic shock of variable duration over solar cycle 21 and 22: Prediction with IRI 2016

Ali Mahamat Nour
  • Ali Mahamat Nour
  • Department of Physics, Faculty of Exact and Applied Sciences, University of N'Djamena, N’Djamena, Chad.
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Douzane Gouara
  • Douzane Gouara
  • Laboratory of Physics of the Atmosphere, Climate and Environment (LaPACE), University of Negauena, Chad.
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Sibri Alphonse Sandwidi
  • Sibri Alphonse Sandwidi
  • Laboratory of Applied Chemistry and Space and Energy Physics (LACAPSE), University of Koudougou, Burkina Faso.
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Frederic Ouattara
  • Frederic Ouattara
  • Laboratory of Applied Chemistry and Space and Energy Physics (LACAPSE), University of Koudougou, Burkina Faso.
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  •  Received: 11 September 2023
  •  Accepted: 01 November 2023
  •  Published: 30 November 2023


This work concerns the comparative study of the diurnal variation of the critical frequency of the F2 layer (foF2) between experimental data from the Dakar station and those of the IRI 2016 model through its URSI. The comparison was conducted during solar cycles 21 and 22, across different phases, and on various days of geomagnetic shock activity. The results indicate that during solar minimum, the graphs of the experimental data generally exhibit the signature of vertical drift, whereas the IRI model presents a plateau profile indicative of the absence of an electrojet. During this phase, the highest deviation percentages were typically observed around sunrise. The results also demonstrate that at the Dakar station, the increasing phase was characterized by a pre-reversal of the electric field on different shock days. Regardless of the duration of the shock, the decreasing phase was marked by the complete absence of an electrojet, as observed in both sets of data. The quantitative study reveals that at solar maximum, our results exhibit a strong correlation between the experimental data and the IRI model. Throughout all phases, predictions were accurate during the daytime and exhibited high values around sunrise.

Key words: foF2, geomagnetic shock activity, IRI model 2016 prediction, solar cycle, sub-programme URSI.