Physics Ionospheric And Radio Propagation Physics
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Topic: Ionospheric Variability Space Weather In The Equatorial Region With Emphasis On The F2 Layer Variations.
Description: Introduction:The F-region is also known as the Appleton layer is from 150 Km above the surface of the earth. It is nearly always the most prominent of all the Ionospheric regions and also the most important region for radio propagation phenomena. It is also highly influenced by the sun s radiation. At night in low latitudes, the concentration does not fall steadily and may even increase during some periods. At night the F1 and F2 layers merge to form a single F region.Aim/Objectives:The aim is to study the behaviour of the F2-layer of the ionosphere in the equatorial region with a view to bring out its characteristics variations with respect to time, season and solar activity.Methodology:The method employed is a statistical approach called Relative Variability VR which is the ratio of the standard deviation of the monthly mean values of the ionospheric parameter to the monthly mean values expressed as a percentage. Root mean square error RMSE and correlation methods are also used.Expected Results:The electron density of the F2-layer is generally much higher in low latitudes and maximum electron density appears at greater heights. It exhibit anomalous behaviour. The anomalous behaviour of F2 region is due to drift motions of ionization in the magnetic field of the earth, driven essentially by electromagnetic E X B forces. Despite the apparent behaviour which F2 region exhibits, it is still taught to be the greatest contributor to the total number of electrons in the ionosphere.Contribution to Knowledge:Both F1 and F2 regions show a variation throughout the sunspot cycle but that of F2 is much greater in amplitude for lower latitudes. The study of the variability of ionospheric F2 characteristics is improving the quantitative understanding of the upper atmosphere.
|Ph.D (Physics Ionospheric and Radio Propagation Physics )
|Department of Physics, Lagos State University LASU , Ojo.
Seasonal Variation of the Critical Frequency of the F2-Layer and its Comparison with IRI-2016 Model during Two Extremes of Solar Activity Period of Solar Cycle 22
Introduction:The International Reference Ionosphere IRI is the global accepted model for forecasting empirical ionospheric parameters such as electron density, critical frequencies of ionopheric layers. IRI was formed as a united project between the Committee on Space Research COSPAR and the International Union of Radio Science URSI . The IRI working team constantly works on the construction and improvement of the IRI model in predicting the variation of the ionospheric layers.Aim/Objective:The aim of this paper is to show the performance of the latest version of the International Reference Ionosphere IRI-2016 model in predicting the critical frequency of the F2-layer foF2 over two equatorial stations during a very high solar activity VHSA year 1989 and a very low solar activity VLSA year 1986 .Methodolgy:The data used in this work are the hourly foF2 experimental data observed at Ougadougou Geomagnetic Latitude 0.59 oN, Geomagnetic Longitude 71.46 oE and Manila Geomagnetic Latitude 3.4 oN, Geomagnetic Longitude 191.1 oE during VHSA year 1989 and VLSA year 1986 and IRI-2016 model predicted foF2 data. Analysis was carried out by first grouping the foF2 data into four different seasons comprising of three months each. The seasonal mean of the IRI-2016 modeled foF2 will be compared with the experimental foF2 data and percentage deviation of the model from the experimental data evaluated.Expected Results:The seasonal mean value of the IRI-2016 model of both options are expected to showed remarkable improvement at this two stations, although, the IRI-2016 model underestimates and overestimates the observed foF2 at certain hours in these stations. The seasonal variation of the experimental foF2 is expected to shows the presence of winter anomaly.Contributiont to Knowledge /Society:The results from the study will help in further updating of the IRI- 2016 model for improvement
ONORI EUGENE is a Senior Lecturer at the Department of Physics
ONORI has a Ph.D in Physics Ionospheric and Radio Propagation Physics from Department of Physics, Lagos State University LASU , Ojo.