Nighttime ionospheric saturation effect estimation in the African Equatorial Anomaly trough: A comparison of two approaches

Ikubanni, S.O. and Adeniyi, J.O. (2016) Nighttime ionospheric saturation effect estimation in the African Equatorial Anomaly trough: A comparison of two approaches. Journal of Geophysical Research - Space Physics, 121 (3). pp. 1643-1657.

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Official URL: http://dx.doi.org/10.1002/2015JA021763

Abstract

Using the two-segmented and the quadratic regression analyses methods, the existence of saturation effect in the ionospheric electron content has been established in published literatures. With data set that spans an 11 year period (one solar cycle) from an African low-latitude station—Ouagadougou, Burkina Faso (Geographical coordinates 12oN, 1.8oW, dip ~3oN)—and adopting the quadratic and the two-segmented regression methods, we have studied nighttime saturation effect on the critical frequency of ionospheric F2 layer (foF2) around the magnetic dip. Bothmethods revealed that saturation effect in foF2 cuts across all seasons during nighttime. This phenomenon was least at the peak of the prereversal enhancement (PRE) period and increases significantly beyond midnight. Either of the two approaches can be adopted for saturation effect studies. The advantage of the two-segmented over the quadratic is that the change point (breakpoint), which is the solar flux levelwhere saturation effects first become observable, can be determined. The effect seen around the PRE period may be attributed to the E × B drift while the effect beyond the PRE period is masked by other mechanisms.

Item Type: Article
Subjects: Q Science > QC Physics
Divisions: Faculty of Engineering, Science and Mathematics > School of Physics
Depositing User: Dr S. O. Ikubanni
Date Deposited: 29 Jun 2017 09:08
Last Modified: 29 Jun 2017 09:08
URI: http://eprints.lmu.edu.ng/id/eprint/545

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