Variability of the Critical Frequency foF2 during Minimum and Maximum Phases of Solar Cycles 20 and 21: A Comparative Study between American and African Equatorial Regions
- 1 Laboratoire de Recherche en Energétique et Météorologie de l’Espace (LAREME) Université Norbert Zongo, Koudougou, Burkina Faso
- 2 Laboratoire de Matériaux, d’Héliophysique et Environnement (LAMHE), Université Nazi Boni, Bobo Dioulasso, Burkina Faso
- 3 Laboratoire de Recherche en Energétique et Météorologie de l’Espace (LAREME) Université Norbert Zongo, Koudougou, Burkina Faso
Abstract
The present work is a comparative study between the foF2 variabilities for two equatorial regions (Ouagadougou: lat. 12 ° 21' N; long. 1 ° 30' E, dip. 1.43 ° in Africa and Huancayo: Lat. 12 ° S ; Long. 75 ° 12'W in America) during solar cycles 20 and 21 minima and maxima phases under geomagnetic extreme conditions (quiet and disturb). Profiles from these two stations are very similar for all the seasons over the solar cycles. However, measured data from Huancayo station are higher than those from Ouagadougou station during winter with a reverse phenomenon for summer. The investigations suggest that the gap between foF2 values and the reverse phenomenon observed for the two stations may be explained by their hemispheric location (Huancayo in south hemisphere and Ouagadougou in North one). Longitudinal irregularities in ionosphere may also contribute to that little difference observed during the time interval of our investigation.
- Ouattara, F. and Zerbo, J.L. (2011) Ouagadougou Station F2 Layer Parameters, Yearly and Seasonal Variations during Severe Geomagnetic Storms Generated by Coronal Mass Ejections (CMEs) and Fluctuating Wind Streams. International Journal of the Physical Sciences, 6, 4854-4860.
- Adeniyi, J.O. and Adimula, I.A. (1995) Comparing the F2-Layer Model of IRI with Observations at Ibadan. Advanced in Space Research, 15, 141-144. https://doi.org/10.1016/S0273-1177(99)80036-2
- Abdu, M.A., Batista, I.S. and De Souza, J.R. (1996) An Overview of IRI-Observational Data Comparison in American (Brazilian) Sector Low Latitude Ionosphere. Advanced in Space Research, 18, 13-22. https://doi.org/10.1016/0273-1177(95)00893-4
- Batista, S., Abdu, M.A., De Medeiros, R.T. and De Paula, E.R. (1996) Comparison between IRI Predictions and Digisonde Measurements at Low Latitude Station. Advanced in Space Research, 18, 49-52. https://doi.org/10.1016/0273-1177(95)00899-3
- Bertoni, F., Sahai, Y., Lima, L., Fagundes, P., Pillat, V., Becker-Guedes, F. and Abalde, J. (2006) IRI-2001 Model Predictions Compared with Ionospheric Data Observed at Brazilian Low Latitude Stations. Annales Geophysicae, 24, 2191-2200. https://doi.org/10.5194/angeo-24-2191-2006
- Bilitza, D., Altadill, D., Zhang, Y., Mertens, C., Truhlik, V., Richards, P., McKinnell, L.A. and Reinisch, B. (2014) The International Reference Ionosphere 2012—A Model of International Collaboration. Journal of Space Weather and Space Climate A, 7, 1-12. https://doi.org/10.1051/swsc/2014004
- Ouattara, F. and Fleury, R. (2011) Variability of CODG TEC and IRI 2001 Total Electron Content (TEC) during IHY Campaign Period (21 March to 16 April 2008) at Niamey under Different Geomagnetic Activity Conditions. Scientific Research and Essays, 17, 3609-3622. http://www.academicjournals.org/SRE https://doi.org/10.5897/SRE
- Tariku, Y.A. (2015) TEC Prediction Performance of the IRI-2012 Model over Ethiopia during the Rising Phase of Solar Cycle 24 (2009-2011). Earth, Planets and Space, 67, 140. https://doi.org/10.1186/s40623-015-0312-1
- Li, S., Li, L. and Peng, J. (2016) Variability of Ionospheric TEC and the Performance of the IRI-2012 Model at the BJFS Station, China. Acta Geophysica, 64, 1970-1987. https://doi.org/10.1515/acgeo-2016-0075
- Sawadogo, W.E., Zerbo, J.-L. and Ouattara, F. (2019) Diurnal Variation of F2-Layer Critical Frequency under Solar Activity Recurrent Conditions during Solar Cycles 21 and 22 at Ouagadougou Station: Prediction with IRI-2012. Scientific Research and Essays, 14, 111-118.