On the variations of ionospheric parameters made at a near equatorial station in the African longitude sector: IRI validation with the experimental observations

摘要: We examine the main morphological patterns and climatological behaviour of equatorial F2 region over African sector using hourly observational values peak height maximum electron density (h m F2), layer (N F2/ foF2), propagation factor (M3000F2) hitherto made by Ibadan ionosonde at 7.4°N, 3.9°E, dip latitude 2.3°S, in Nigeria; between January to December 1958, during a period high solar activity (yearly averaged Rz12 = 190 units) magnetically quiet conditions (Kp ≤ 3). A direct comparison these measurements International Reference Ionosphere 2007 (IRI-2007) model-predictions are also made. The results comparisons illustrate that good advancement has been but reveal some important discrepancies. trends experimental data found be excellent agreement with simulation for factor, fair-to-good altitude. model is unable capture sharp postsunset predawn enhancements h M3000F2, respectively. have errors ranging from approximately 8–15%, 9–17%, 3–5%, respectively, F2, N M3000F2. On average, percent absolute relative difference observations varies about 0–20%, 0–30%, 0–10% order. Our essentially consistent other low-latitude ground-based South America, India, Southeast Asia.