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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
Ionospheric imaging in Africa
Radio Science, Volume 49, No. 1, Year 2014
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Description
Accurate ionospheric specification is necessary for improving human activities such as radar detection, navigation, and Earth observation. This is of particular importance in Africa, where strong plasma density gradients exist due to the equatorial ionization anomaly. In this paper the accuracy of three-dimensional ionospheric images is assessed over a 2 week test period (2-16 December 2012). These images are produced using differential Global Positioning System (GPS) slant total electron content observations and a time-dependent tomography algorithm. The test period is selected to coincide with a period of increased GPS data availability from the African Geodetic Reference Frame (AFREF) project. A simulation approach that includes the addition of realistic errors is employed in order to provide a ground truth. Results show that the inclusion of observations from the AFREF archive significantly reduces ionospheric specification errors across the African sector, especially in regions that are poorly served by the permanent network of GPS receivers. The permanent network could be improved by adding extra sites and by reducing the number of service outages that affect the existing sites. Key Points Ionospheric image quality in Africa is assessed Simulated and real data are both used An extended receiver network greatly improves accuracy ©2013. The Authors.
Authors & Co-Authors
Chartier, Alex T.
United Kingdom, Bath
University of Bath
United Kingdom, Exeter
Met Office
Kinrade, Joe
United Kingdom, Bath
University of Bath
Mitchell, Cathryn N.
United Kingdom, Bath
University of Bath
Rose, J. A.R.
United Kingdom, Bath
University of Bath
Jackson, David R.
United Kingdom, Bath
University of Bath
United Kingdom, Exeter
Met Office
Cilliers, Pierre J.
South Africa, Pretoria
South African National Space Agency
Habarulema, John Bosco
South Africa, Pretoria
South African National Space Agency
Katamzi, Zama Thobeka
South Africa, Pretoria
South African National Space Agency
McKinnell, Lee Anne
South Africa, Pretoria
South African National Space Agency
Matamba, Tshimangadzo Merline
South Africa, Pretoria
South African National Space Agency
Opperman, Ben D.L.
South Africa, Pretoria
South African National Space Agency
Ssessanga, Nicholas
South Africa, Pretoria
South African National Space Agency
Giday, Nigussie Mezgebe
South Africa, Pretoria
South African National Space Agency
Tyalimpi, Vumile
South Africa, Pretoria
South African National Space Agency
Franceschi, Giorgiana De
Italy, Rome
Istituto Nazionale Di Geofisica e Vulcanologia, Rome
Romano, Vincenzo
Italy, Rome
Istituto Nazionale Di Geofisica e Vulcanologia, Rome
Scotto, Carlo
Italy, Rome
Istituto Nazionale Di Geofisica e Vulcanologia, Rome
Notarpietro, Riccardo
Italy, Turin
Politecnico Di Torino
Dovis, Fabio
Italy, Turin
Politecnico Di Torino
Avenant, Eugene
Unknown Affiliation
Wonnacott, R.
South Africa, Cape Town
National Geospatial Information
Oyeyemi, Elijah O.
South Africa, Grahamstown
Rhodes University
Mahrous, Ayman M.
Egypt, Helwan
Helwan University
Mengistu Tsidu, Gizaw
Ethiopia, Addis Ababa
Addis Ababa University
Lekamisy, Harvey
Madagascar, Antananarivo
Madagascar Civil Aviation Authority
Olwendo, Joseph Ouko
Kenya, Kilifi
Pwani University
Sibanda, Patrick
Zambia, Lusaka
University of Zambia
Gogie, Tsegaye Kassa
Ethiopia, Bahir Dar
Bahir Dar University
Rabiu, A. Babatunde
Nigeria, Abuja
National Space Research and Development Agency
Jong, Kees De
Netherlands, Leidschendam
Fugro
Adewale, Adekola Olajide
Nigeria, Lagos
University of Lagos
Statistics
Citations: 31
Authors: 31
Affiliations: 16
Identifiers
Doi:
10.1002/2013RS005238
ISSN:
00486604
e-ISSN:
1944799X