Seasonal Variability of foE and Nocturnal Winter Anomaly in E-layer during Solar Cycles 21 and 22 at the Ouagadougou Station

Sawadogo Gédéon *

Laboratoire de Recherche en Energétique et Météorologie de l'Espace (LAREME), Université Norbert Zongo, BP 376 Koudougou, Burkina Faso.

Nakolemda Roger

Laboratoire de Recherche en Energétique et Météorologie de l'Espace (LAREME), Université Norbert Zongo, BP 376 Koudougou, Burkina Faso.

Konaté Moustapha

Centre Universitaire de Gaoua, Université Nazi Boni, 01 BP 1091 Bobo-Dioulasso 01, Burkina Faso.

Nanéma Emmanuel

Laboratoire de Recherche en Energétique et Météorologie de l'Espace (LAREME), Université Norbert Zongo, BP 376 Koudougou, Burkina Faso and Center National de la Recherche Scientifique et Technologique (CNRST), Institut de Recherche en Sciences Appliquées et Technologies (IRSAT), 03 BP 7047 Ouagadougou, Burkina Faso.

*Author to whom correspondence should be addressed.


Abstract

This paper aims to study the variability of foE during two solar cycles 21 (SC21) and 22 (SC22) at Ouagadougou station (lat = 12.4°N, long = 358.5°E, local time (LT) = universal time (UT)), to give visibility on the behavior of foE in this station. We used International Reference Ionosphere (IRI-2016) to collect data from five (5) quiet days of each characteristic month of each season. This study reveals that in this station located at the ionospheric equator, the variability of foE follows the evolution of the sun intensity during the day. There is a correlation between foE and the solar cycle phase, the season, and the time of day. During the day [0500 LT-1900LT], the foE profile does not show a winter anomaly, contrary to what is observed in the F2 layer  at the minimum and maximum  SC21 and SC22. On the other hand, a nocturnal winter anomaly was observed related to that observed in the F2 layer in the same periods. The study of foE at the Ouagadougou station will allow ionospheric physicists to have visibility on the seasonal variability of foE in this station.

Keywords: Equinoctial asymmetry, foE variability, season, solar cycle phase, winter anomaly


How to Cite

Gédéon, Sawadogo, Nakolemda Roger, Konaté Moustapha, and Nanéma Emmanuel. 2022. “Seasonal Variability of FoE and Nocturnal Winter Anomaly in E-Layer During Solar Cycles 21 and 22 at the Ouagadougou Station”. Physical Science International Journal 26 (2):1-10. https://doi.org/10.9734/psij/2022/v26i230307.

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