Seasonal, Diurnal, and Solar-Cycle Variations of Electron Density at Two West Africa Equatorial Ionization Anomaly Stations
Joint Authors
Gnabahou, Doua Allain
Ouattara, Frédéric
Amory Mazaudier, Christine
Source
International Journal of Geophysics
Issue
Vol. 2012, Issue 2012 (31 Dec. 2012), pp.1-9, 9 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2012-05-09
Country of Publication
Egypt
No. of Pages
9
Main Subjects
Abstract EN
We analyse the variability of foF2 at two West Africa equatorial ionization anomaly stations (Ouagadougou and Dakar) during three solar cycles (from cycle 20 to cycle 22), that is, from 1966 to 1998 for Ouagadougou and from 1971 to 1997 for Dakar.
We examine the effect of the changing levels of solar extreme ultraviolet radiation with sunspot number.
The study shows high correlation between foF2 and sunspot number (Rz).
The correlation coefficient decreases from cycle 20 to cycle 21 at both stations.
From cycle 21 to cycle 22 it decreases at Ouagadougou station and increases at Dakar station.
The best correlation coefficient, 0.990, is obtained for Dakar station during solar cycle 22.
The seasonal variation displays equinoctial peaks that are asymmetric between March and September.
The percentage deviations of monthly average data from one solar cycle to another display variability with respect to solar cycle phase and show solar ultraviolet radiation variability with solar cycle phase.
The diurnal variation shows a noon bite out with a predominant late-afternoon peak except during the maximum phase of the solar cycle.
The diurnal Ouagadougou station foF2 data do not show a significant difference between the increasing and decreasing cycle phases, while Dakar station data do show it, particularly for cycle 21.
The percentage deviations of diurnal variations from solar-minimum conditions show more ionosphere during solar cycle 21 at both stations for all three of the other phases of the solar cycle.
There is no significant variability of ionosphere during increasing and decreasing solar cycle phases at Ouagadougou station, but at Dakar station there is a significant variability of ionosphere during these two solar-cycle phases.
American Psychological Association (APA)
Ouattara, Frédéric& Gnabahou, Doua Allain& Amory Mazaudier, Christine. 2012. Seasonal, Diurnal, and Solar-Cycle Variations of Electron Density at Two West Africa Equatorial Ionization Anomaly Stations. International Journal of Geophysics،Vol. 2012, no. 2012, pp.1-9.
https://search.emarefa.net/detail/BIM-487419
Modern Language Association (MLA)
Ouattara, Frédéric…[et al.]. Seasonal, Diurnal, and Solar-Cycle Variations of Electron Density at Two West Africa Equatorial Ionization Anomaly Stations. International Journal of Geophysics No. 2012 (2012), pp.1-9.
https://search.emarefa.net/detail/BIM-487419
American Medical Association (AMA)
Ouattara, Frédéric& Gnabahou, Doua Allain& Amory Mazaudier, Christine. Seasonal, Diurnal, and Solar-Cycle Variations of Electron Density at Two West Africa Equatorial Ionization Anomaly Stations. International Journal of Geophysics. 2012. Vol. 2012, no. 2012, pp.1-9.
https://search.emarefa.net/detail/BIM-487419
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-487419