Search Results - "McKinnell, L."

The Economic Impact of Space Weather: Where Do We Stand? by Eastwood, J. P., Biffis, E., Hapgood, M. A., Green, L., Bisi, M. M., Bentley, R. D., Wicks, R., McKinnell, L.‐A., Gibbs, M., Burnett, C.

“…Space weather describes the way in which the Sun, and conditions in space more generally, impact human activity and technology both in space and on the ground…”
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Investigating the performance of neural network backpropagation algorithms for TEC estimations using South African GPS data by HABARULEMA, J. B, MCKINNELL, L.-A

“…In this work, results obtained by investigating the application of different neural network backpropagation training algorithms are presented. This was done to…”
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Estimating the geoeffectiveness of halo CMEs from associated solar and IP parameters using neural networks by UWAMAHORO, J, MCKINNELL, L. A, HABARULEMA, J. B

“…Estimating the geoeffectiveness of solar events is of significant importance for space weather modelling and prediction. This paper describes the development…”
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Present day challenges in understanding the geomagnetic hazard to national power grids by Thomson, A.W.P., Gaunt, C.T., Cilliers, P., Wild, J.A., Opperman, B., McKinnell, L.-A., Kotze, P., Ngwira, C.M., Lotz, S.I.

“…Power grids and pipeline networks at all latitudes are known to be at risk from the natural hazard of geomagnetically induced currents. At a recent workshop in…”
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Solar and interplanetary precursors of geomagnetic storms in solar cycle 23 by Uwamahoro, J., McKinnell, L.-A.

“…Estimating the magnetic storm effectiveness of solar and associated interplanetary phenomena is of practical importance for space weather modelling and…”
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Topside ionospheric vertical electron density profile reconstruction using GPS and ionosonde data: possibilities for South Africa by SIBANDA, P, MCKINNELL, L. A

“…Successful empirical modeling of the topside ionosphere relies on the availability of good quality measured data. The Alouette, ISIS and Intercosmos-19…”
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Statistical investigation of horizontal propagation of gravity waves in the ionosphere over Europe and South Africa by Chum, J., Athieno, R., Baše, J., Burešová, D., Hruška, F., Laštovička, J., McKinnell, L. A., Šindelářová, T.

“…A statistical investigation into the horizontal propagation of ∼8–30 min gravity waves (GWs) in the ionosphere over a 1 year period from June 2010 to May 2011…”
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Observations of wave activity in the ionosphere over South Africa in geomagnetically quiet and disturbed periods by Sindelarova, T., Mosna, Z., Buresova, D., Chum, J., McKinnell, L.-A., Athieno, R.

“…The present paper deals with observations of wave activity in the period range 1–60min at ionospheric heights over the Western Cape, South Africa from May 2010…”
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A recurrent neural network approach to quantitatively studying solar wind effects on TEC derived from GPS; preliminary results by HABARULEMA, J. B, MCKINNELL, L.-A, OPPERMAN, B. D. L

“…This paper attempts to describe the search for the parameter(s) to represent solar wind effects in Global Positioning System total electron content (GPS TEC)…”
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Low solar activity variability and IRI 2007 predictability of equatorial Africa GPS TEC by Adewale, A.O., Oyeyemi, E.O., Cilliers, P.J., McKinnell, L.A., Adeloye, A.B.

“…Diurnal, seasonal and latitudinal variations of Vertical Total Electron Content (VTEC) over the equatorial region of the African continent and a comparison…”
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Progress towards a new global foF2 model for the International Reference Ionosphere (IRI) by McKinnell, L.A., Oyeyemi, E.O.

“…A new neural network (NN) based global empirical model for the foF2 parameter, which represents the peak electron density has been developed using extended…”
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Developing an ionospheric map for South Africa by Okoh, D. I., McKinnell, L. A., Cilliers, P. J.

“…The development of a map of the ionosphere over South Africa is presented in this paper. The International Reference Ionosphere (IRI) model, South African…”
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Evaluation of the STORM model storm-time corrections for middle latitude by Buresova, D., McKinnell, L.-A., Sindelarova, T., De La Morena, B.A.

“…This paper presents results from the Storm-Time Ionospheric Correction Model (STORM) validation for selected Northern and Southern Hemisphere middle latitude…”
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Near-real time foF2 predictions using neural networks by Oyeyemi, Elijah O., McKinnell, L.A., Poole, A.W.V.

“…This paper describes the use of the neural network (NN) technique for the development of a near-real time global foF2 (NRTNN) empirical model. The data used…”
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Evaluating the IRI topside model for the South African region: An overview of the modelling techniques by Sibanda, P., McKinnell, L.A.

“…The representation of the topside ionosphere (the region above the F2 peak) is critical because of the limited experimental data available. Over the years, a…”
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A new global F2 peak electron density model for the International Reference Ionosphere (IRI) by Oyeyemi, E.O., McKinnell, L.A.

“…A new neural network (NN) based global empirical model for the F2 peak electron density (NmF2) has been developed using extended temporal and spatial…”
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Validation of University of New Brunswick Ionospheric Modeling Technique with ionosonde TEC estimation over South Africa by Moeketsi, D.M., McKinnell, L.A., Combrinck, W.L.

“…For more than a decade, ionospheric research over South Africa has been carried out using data from ionosondes geographically located at Madimbo (28.38°S,…”
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Comparisons of observed ionospheric F2 peak parameters with IRI-2001 predictions over South Africa by Adewale, A.O., Oyeyemi, E.O., McKinnell, L.A.

“…The monthly means of the ionospheric F2 peak parameters ( foF2 and hmF2) over three stations in South Africa (Grahamstown, 33.3°S, 26.5°E, Madimbo, 22.4°S,…”
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Application of neural networks to South African GPS TEC modelling by Habarulema, John Bosco, McKinnell, Lee-Anne, Cilliers, Pierre J., Opperman, Ben D.L.

“…The propagation of radio signals in the Earth’s atmosphere is dominantly affected by the ionosphere due to its dispersive nature. Global Positioning System…”
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A neural network-based ionospheric model for Arecibo by Friedrich, M., Fankhauser, M., Oyeyemi, E., McKinnell, L.A.

“…The Arecibo Observatory (18°N, 66°W) has the world’s largest single dish antenna (300 m diameter). Beyond radio astronomy it can also operate as an incoherent…”
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