TY  - JOUR
T1  - Variability of the Critical Frequency of the F<SUB>2</SUB> Layer, foF<SUB>2</SUB> in West Africa using Ionosonde Stations at Ouagadougou and Dakar
AU - Salami, O.R. AU - Nymphas, E.F. 
JO  - Research Journal of Applied Sciences
VL  - 7
IS  - 9
SP  - 474
EP  - 480
PY  - 2012
DA  - 2001/08/19
SN  - 1815-932x
DO  - rjasci.2012.474.480
UR  - https://makhillpublications.co/view-article.php?doi=rjasci.2012.474.480
KW  - Ionosphere
KW  -variability of foF2
KW  -critical frequency
KW  -equatorial input
KW  -West Africa
AB  - The critical frequency of the F<SUB>2</SUB> layer of the ionosphere, foF<SUB>2</SUB> is responsible for various effects on radio communication such as refraction, scintillation, absorption, error in Global Positioning System (GPS), jitter and phase delay. The variations of the critical frequency of the F<SUB>2</SUB> layer at two different locations over West Africa were studied using ionosonde data for a solar cycle (1979 to 1989) at low, moderate and high solar activity, 1986, 1983 and 1989, respectively. The ionosonde stations are Dakar in Senegal (15&deg;N, 17&deg;W) and Ouagadougou in Burkina Faso (12&deg;N, 1.8&deg;W). The investigation of critical frequency of the F<SUB>2</SUB> layer, foF<SUB>2</SUB> using Relative Standard Deviation (RSD) revealed the spread and the occurrence of foF<SUB>2</SUB>. The results obtained in this study are proposed as equatorial input values for the development of a Variability Model for the International Reference Ionosphere.
ER  -