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MODELLING M(3000)F2 AT AN AFRICAN EQUATORIAL LOCATION FOR BETTER IRI-MODEL PREDICTION
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  • Babatunde OLUFEMI ADEBESIN,
  • J. O ADENIYI,
  • Peter A AFOLABI,
  • Shola John Adebiyi,
  • Stephen Oluwole IKUBANNI
Babatunde OLUFEMI ADEBESIN
Landmark University

Corresponding Author:[email protected]

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J. O ADENIYI
LANDMARK UNIVERSITY
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Peter A AFOLABI
Department Physics, College of Education, Oro, Kwara State, Nigeria.
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Shola John Adebiyi
Landmark University
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Stephen Oluwole IKUBANNI
Landmark University, Omu-Aran
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Abstract

The F2-layer propagation factor M(3000)F2 is important to ionospheric studies owning to its use in HF radio communication/ionospheric modelling. This study focused on reducing the shortcomings in the use of M(3000)F2 IRI-model for obtaining hmF2, especially in the African equatorial region, by obtaining an empirical ‘constructed model’ (M(3000)F2CM ) using the Korhogo (geomag. lat. 1.26°S, long. 67.38°E, dip.-0.670S) data (M(3000)F2KOR). The data spans 8 years (1993-2000) under magnetically quiet conditions (Ap< 20nT). The Regression method technique was used in obtaining the M(3000)F2CM. The M(3000)F2KOR results revealed that low solar activity (LSA) years have predominantly higher magnitudes than high solar activities (HSA) for all seasons, revealing solar activity dependence. The regression coefficient (R2) for the M(3000)F2KOR versus F10.7 relationship was stronger during the solstices. The associated diurnal equations obtained for all seasons from the regression plot of the M(3000)F2KOR-F10.7 relationship were used to obtained the constructed model equation given by , which allows the prediction of diurnal, seasonal and solar cycle variation of the M(3000)F2 parameter. M(3000)F2CM predicted well when tested at different solar activities. Generally, M(3000)F2CM performed reasonably well in comparison with the IRI model (M(3000)F2IRI) when validated with Ouagadougou (lat. 0.59°S, long. 71.46°E) observed data - M(3000)F2OUA. The %deviation of M(3000)F2CM versus M(3000)F2OUA during HSA and LSA ranges from -10.8- 5.3/-7.6 - 15.8 for solstices/equinoxes; whereas %deviation of M(3000)F2IRI versus M(3000)F2OUA spans -15.5 - 9.2 and -9.7 - 17.7 in similar order of seasons. These results suggest that the new model has a measure of potential for its use in the equatorial region.