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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

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Document pages: 17 pages

Abstract: This paper aims to establish a comparison betweenboth geomagnetic activity classification methods on foF2 diurnal variation oversolar cycle phases. It concerns first a comparison of geomagnetic activityoccurrences according to both classification methods; and second thegeomagnetic effect on foF2 diurnal variation profiles as defined for theequatorial latitudes. The occurrences of the different disturbed geomagneticactivities (recurrent activity (RA), shock activity (SA) and fluctuant activity(FA)) according to both classifications (ancient classification (AC) and newclassification (NC)) have been studied at Dakar ionosonde station (Lat: 14.8°N;Long: 342.6°E). Regarding both classifications, the RA occurs more during thedecreasing phase. And it’s observed that the RA occurs the most during theincreasing phase for the AC and during the minimum phase for the NC. Themaximum gap of occurrence () between both classifications is &#4511.1 (for the negative value which is observedduring 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 lowestduring the minimum phase and the maximum occurrence is observed during themaximum and decreasing phases, for the AC, with a value close to 37 and for the NC at the maximum phase with apercentage of 54.47 . Themaximum gap of occurrence () between both classifications is &#4517.85 (for the negative value which is observed atmaximum phase) and +13.53 (forthe positive one which is observed during the decreasing phase). For bothclassifications, the FA occurs the least during the minimum phase and the mostduring the maximum phase for the AC and at maximum and decreasing phases withpercentage values of occurrence of roughly 37 for the NC. The maximum gap of occurrence () between both classifications is &#4510 (for thenegative value which is observed during the decreasing phase) and +20.11 (for the positive one which is observedduring the maximum phase). foF2 diurnal profiles throughout solar cycle phasesconcerning the AC and the NC have been compared. The FA diurnal profiles don’tpresent a difference. The RA and the SA present a difference during minimum andincreasing phases and the least at maximum and decreasing phases.

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