Adeniyi, J.O. and Agunbiade, G. and Olawepo, A.O. and Oladipo, O.A. and Adimula, I.A. and Ikubanni, S.O. (2016) Low Latitude Spread-F Occurrence during June Solstice and September Equinox of Sunspot Minimum. The African Review of Physics, 12. pp. 29-35.
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Abstract
Ionosonde data from four low-latitude stations cutting across the two hemispheres have been employed to study the occurrence of spread-F. Quiet time ionograms for two months representing two seasons; June solstice and September equinox of the year 2010, a year of low solar activity (Rz = 16) were utilized. Results showed that the low latitude nighttime ionosphere is characterized by three different types of spread-F; range spread F, frequency spread F and mixed spread F. Spread F irregularity exhibits diurnal, seasonal and latitudinal dependence. Strong dependence on the magnetic dip latitude was observed in this study. At all the four stations, range spread-F (RSF) dominates the post-sunset period (1800 – 2200 LT) while the frequency type (FSF) dominates the post midnight period (0200 – 0400 LT). In general, the RSF has highest occurrence rate at all stations. The study revealed that occurrence of ESF is highest at Ilorin and lowest at Kwajalein with 33.9% and 16.8% respectively. Analysis of the total percentage occurrence of spread F revealed that the phenomenon exhibit hemispheric asymmetry during June solstice.
| Item Type: | Article |
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| Subjects: | Q Science > Q Science (General) |
| Divisions: | Faculty of Engineering, Science and Mathematics > School of Physics |
| Depositing User: | Dr S. O. Ikubanni |
| Date Deposited: | 22 Aug 2018 12:54 |
| Last Modified: | 22 Aug 2018 12:54 |
| URI: | https://eprints.lmu.edu.ng/id/eprint/997 |
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