Abstract
The present paper deals with the effect of recurrent activity on the foF2 diurnal variation at Ouagadougou station for solar cycles 21 and 22. The recurrent activity produces at daytime positive storm for all solar cycle phases. For all seasons, the recurrent activity causes positive storm during nighttime and has no effect during daytime. From this study, it emerges that a positive effect of the storm at this station may be explained by the thermospheric composition changes. Recurrent activity more occurs during the solar decreasing phase and during spring month. The storm strength shows solar cycle phase and seasonal dependence. The storm strength is the highest during the solar increasing phase and during summer months.
Highlights
IntroductionLegrand and Simon [2] studied and classified the geomagnetic activity by using 1) the geomagnetic aa index carried out by Mayaud [3] [4], 2) the date of Sudden Storm Commencement (SSC) and 3) the correlation existing between the geomagnetic aa index and the solar wind speed established by Svalgaard [5]
An interaction between magnetized plasma propagating from the Sun and magnetic fields in the near-Earth space environment causes a global magnetic disturbance namely geomagnetic storms [1] which are due to geomagnetic activities.Legrand and Simon [2] studied and classified the geomagnetic activity by using 1) the geomagnetic aa index carried out by Mayaud [3] [4], 2) the date of Sudden Storm Commencement (SSC) and 3) the correlation existing between the geomagnetic aa index and the solar wind speed established by Svalgaard [5]
The recurrent activity produces at daytime positive storm for all solar cycle phases
Summary
Legrand and Simon [2] studied and classified the geomagnetic activity by using 1) the geomagnetic aa index carried out by Mayaud [3] [4], 2) the date of Sudden Storm Commencement (SSC) and 3) the correlation existing between the geomagnetic aa index and the solar wind speed established by Svalgaard [5]. Their four classes are: 1) quiet magnetic activity due to slow solar wind; 2) recurrent activity related to high speed solar wind streams coming from coronal. It is well known that the F layer depends on: 1) the sunspot cycle [7] [8]; 2) the Sun-Earth relative position at the origin of the seasonal variation and equinoctial maxima [9] [10]; 3) the solar wind speed [11] [12] and the shock activity [13]
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