Recurrent Events’ Impacts on foF2 Diurnal Variations at Dakar Station during Solar Cycles 21-22
This paper deals with recurrent events’ (REs’) impacts on foF2’s diurnal variations at Dakar station (lat: 14.8° N, long: 342.6° E, Senegal) during solar cycles 21 and 22. Data were analyzed by taking in account solar phases and seasons influence. REs generate positive storms in all seasons and on a...
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| Format: | Article |
| Language: | English |
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Wiley
2022-01-01
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| Series: | International Journal of Geophysics |
| Online Access: | http://dx.doi.org/10.1155/2022/4883155 |
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| author | Sibri Alphonse Sandwidi Frédéric Ouattara |
| author_facet | Sibri Alphonse Sandwidi Frédéric Ouattara |
| author_sort | Sibri Alphonse Sandwidi |
| collection | DOAJ |
| description | This paper deals with recurrent events’ (REs’) impacts on foF2’s diurnal variations at Dakar station (lat: 14.8° N, long: 342.6° E, Senegal) during solar cycles 21 and 22. Data were analyzed by taking in account solar phases and seasons influence. REs generate positive storms in all seasons and on all solar phases and also weak negative storms in all seasons and at minimum and maximum solar phases. The results suggest on the one hand that vertical drift E×B due to strong electrojet currents cannot be considered an important mechanism of positive storms and on the other hand that prereversal enhancement (PRE) phenomenon (with a delay due to Dakar station position) and equatorward thermospheric neutral winds circulation (TNWC) contribute mainly to their generation. The intense positive storms, which appear mostly at night, are observed in decreasing phase and in spring which correspond, respectively, to the solar phase and the season of maximum REs occurrence. Then, positive storms’ strength presents seasonal and solar cycle dependence and it is related to REs days occurrence. REs’ negative storms strength are linked directly with REs days’ occurrence on solar phase scale, while they are not on seasonal scale. |
| format | Article |
| id | doaj-art-ce0455eb38594b618162a8e6434af8b2 |
| institution | Kabale University |
| issn | 1687-8868 |
| language | English |
| publishDate | 2022-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | International Journal of Geophysics |
| spelling | doaj-art-ce0455eb38594b618162a8e6434af8b22025-02-03T01:07:22ZengWileyInternational Journal of Geophysics1687-88682022-01-01202210.1155/2022/4883155Recurrent Events’ Impacts on foF2 Diurnal Variations at Dakar Station during Solar Cycles 21-22Sibri Alphonse Sandwidi0Frédéric Ouattara1Laboratoire de Recherche en Energétique et Météorologie de l’Espace (LAREME)Laboratoire de Recherche en Energétique et Météorologie de l’Espace (LAREME)This paper deals with recurrent events’ (REs’) impacts on foF2’s diurnal variations at Dakar station (lat: 14.8° N, long: 342.6° E, Senegal) during solar cycles 21 and 22. Data were analyzed by taking in account solar phases and seasons influence. REs generate positive storms in all seasons and on all solar phases and also weak negative storms in all seasons and at minimum and maximum solar phases. The results suggest on the one hand that vertical drift E×B due to strong electrojet currents cannot be considered an important mechanism of positive storms and on the other hand that prereversal enhancement (PRE) phenomenon (with a delay due to Dakar station position) and equatorward thermospheric neutral winds circulation (TNWC) contribute mainly to their generation. The intense positive storms, which appear mostly at night, are observed in decreasing phase and in spring which correspond, respectively, to the solar phase and the season of maximum REs occurrence. Then, positive storms’ strength presents seasonal and solar cycle dependence and it is related to REs days occurrence. REs’ negative storms strength are linked directly with REs days’ occurrence on solar phase scale, while they are not on seasonal scale.http://dx.doi.org/10.1155/2022/4883155 |
| spellingShingle | Sibri Alphonse Sandwidi Frédéric Ouattara Recurrent Events’ Impacts on foF2 Diurnal Variations at Dakar Station during Solar Cycles 21-22 International Journal of Geophysics |
| title | Recurrent Events’ Impacts on foF2 Diurnal Variations at Dakar Station during Solar Cycles 21-22 |
| title_full | Recurrent Events’ Impacts on foF2 Diurnal Variations at Dakar Station during Solar Cycles 21-22 |
| title_fullStr | Recurrent Events’ Impacts on foF2 Diurnal Variations at Dakar Station during Solar Cycles 21-22 |
| title_full_unstemmed | Recurrent Events’ Impacts on foF2 Diurnal Variations at Dakar Station during Solar Cycles 21-22 |
| title_short | Recurrent Events’ Impacts on foF2 Diurnal Variations at Dakar Station during Solar Cycles 21-22 |
| title_sort | recurrent events impacts on fof2 diurnal variations at dakar station during solar cycles 21 22 |
| url | http://dx.doi.org/10.1155/2022/4883155 |
| work_keys_str_mv | AT sibrialphonsesandwidi recurrenteventsimpactsonfof2diurnalvariationsatdakarstationduringsolarcycles2122 AT fredericouattara recurrenteventsimpactsonfof2diurnalvariationsatdakarstationduringsolarcycles2122 |