VariabilityoffoF2 at Low Latitude during High, Moderate and Low Solar Activity

Khoobchandani, Geeta; Mishra, Subhashree; Vijay, S. K.

doi:10.14445/22315381/ijett-v44p211

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“…Due to the importance of the practical and efficient use of the ionosphere for radio wave propagation, several variability studies has been undertaken at different latitudes and has employed several ionospheric parameters (Jayachandran et al 1995;Forbes et al 2000;Rishbeth and Mendillo, 2001; Kouris and Fotiadis, 2002b;Fotiadis et al 2004;Bilitza et al 2004). Specific studies on the equatorial ionosphere in the African sector include Bilitza et al (2004), Adeniyi et al (2007), Akala et al (2010a,b) and Abe et al (2013), as well as in the Asian, American, and Australian sectors (Akala et al, 2011;Khoobchandani et al, 2017).…”

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confidence: 99%

Dynamics of sunspot cycle ascending and descending phases asymmetry in equatorial ionospheric variability

Ikubanni

Adeniyi

Adebesin

et al. 2019

Journal of Atmospheric and Solar-Terrestrial Physics

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Ionospheric variation from the climatological mean has been extensively studied due to its effect on ionospheric high frequency radio propagation. This work reports foF2 variation at Ouagadougou (geogr. 12 o N, 1.8 o W, dip ∼3°), complementing works that have been done at this station. Nighttime variability is higher than daytime and varies with season but with no consistent pattern. There is an earlier post-midnight peak variability in June solstice (around 0100LT) and occurred between 0400 and 0500LT in other seasons for all sunspot classifications except solar maxima. In this study, we have paid attention to features in the ascending/decending phase of the sunspot cycle and we observed that nighttime ionospheric variability may not always decrease with increasing sunspot number, particularly in the ascending phase. The mechanisms for the difference between observations in the ascending and descending phases could not be identified.

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