Solar wind fluctuations and solar activity long-term swing: 1963-2012

Zerbo, Jean Louis; Amory‐Mazaudier, Christine; Ouattara, Frédéric

doi:10.1017/s1743921313011617

Proc. IAU

2013

DOI: 10.1017/s1743921313011617

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Solar wind fluctuations and solar activity long-term swing: 1963-2012

Jean Louis Zerbo

Christine Amory‐Mazaudier

Frédéric Ouattara

Abstract: Abstract. In this study we investigate the time variation of several solar activity, geomagnetic indices, and solar wind parameters (B, V). It is well known that solar wind is one of the main contributing factors to geomagnetic activity and his topology is strongly affect by solar events such as CMEs and coronals. For these two solar events, we study the correlation between PCI and BV during solar cycle phases and point out the close link between PCI and the occurring of CMEs and high wind speed flowing from c… Show more

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2020

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Comparative Study of the Geomagnetic Activity Effect on foF2 Variation as Defined by the Two Classification Methods at Dakar Station over Solar Cycle Phases

Sandwidi¹,

Gnabahou²,

Ouattara³

2020

IJG

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This paper aims to establish a comparison between both geomagnetic activity classification methods on foF2 diurnal variation over solar cycle phases. It concerns first a comparison of geomagnetic activity occurrences according to both classification methods; and second the geomagnetic effect on foF2 diurnal variation profiles as defined for the equatorial latitudes. The occurrences of the different disturbed geomagnetic activities (recurrent activity (RA), shock activity (SA) and fluctuant activity (FA)) according to both classifications (ancient classification (AC) and new classification (NC)) have been studied at Dakar ionosonde station (Lat: 14.8˚N; Long: 342.6˚E). Regarding both classifications, the RA occurs more during the decreasing phase. And it's observed that the RA occurs the most during the increasing phase for the AC and during the minimum phase for the NC. The maximum gap of occurrence (occ ∆) between both classifications is −11.1% (for the negative value which is observed during the increasing phase) and +16.74% (for the positive one which is observed during the decreasing phase). The occurrence of the SA in relation with both classifications is the lowest during the minimum phase and the maximum occurrence is observed during the maximum and decreasing phases, for the AC, with a value close to 37% and for the NC at the maximum phase with a percentage of 54.47%. The maximum gap of occurrence (occ ∆) between both classifications is −17.85% (for the negative value which is observed at maximum phase) and +13.53% (for the positive one which is observed during the decreasing phase). For both classifications, the FA occurs the least during the minimum phase and the most during the maximum phase for the AC and at maximum and decreasing phases with percentage How to cite this paper: Sandwidi, S.A., Gnabahou, D.A. and Ouattara, F. (2020) Comparative Study of the Geomagnetic Activity Effect on foF2 Variation as Defined by the Two Classification Methods at Dakar Station over Solar Cycle Phases.

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Comparative Study of the Geomagnetic Activity Effect on foF2 Variation as Defined by the Two Classification Methods at Dakar Station over Solar Cycle Phases

Sandwidi¹,

Gnabahou²,

Ouattara³

2020

IJG

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show abstract

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Solar wind fluctuations and solar activity long-term swing: 1963-2012

Cited by 1 publication

References 4 publications

Comparative Study of the Geomagnetic Activity Effect on foF2 Variation as Defined by the Two Classification Methods at Dakar Station over Solar Cycle Phases

Comparative Study of the Geomagnetic Activity Effect on foF2 Variation as Defined by the Two Classification Methods at Dakar Station over Solar Cycle Phases

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