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Table 1 Locations of the African stations where geomagnetic data are collected for this study

From: Estimating ionospheric currents by inversion from ground-based geomagnetic data and calculating geoelectric fields for studies of geomagnetically induced currents

Observatory

Coordinates [zero altitude assumed]

Network

Geographic

Geomagnetica (IGRF 2013)

Apexb (Year 2013.5)

Addis Ababa, Ethiopia

9.03N, 38.77E

5.32N, 112.37E

[0.9018N; 0.9022N], 111.90E

INTERMAGNET (AAE)

Adigrat, Ethiopia

14.28N, 39.46E

10.36N, 113.89E

[6.8432N; 6.8469N], 112.36E

AMBER (ADET)

  1. The stations belong to two different networks
  2. aFrom http://wdc.kugi.kyoto-u.ac.jp/igrf/gggm/index.html
  3. bFrom http://ccmc.gsfc.nasa.gov/coord_transform/index.php; Source (Richmond 1995); Apex format [MagApex-Latitude; QuasiDipole-Latitude], MA/QD-Longitude