Table 1. Characteristics and geographical locations of the stations

STATION	Geographic coordinates		Station characteristics
	Latitude	Longitude
MORP	55.21	–1.68	Mid-northern latitude
MAD2	40.43	–4.25	Mid-northern latitude
IGB0	12.37	–1.51	Low latitude, EIA region
STHL	–15.94	–5.67	Low southern latitude

EIA, equatorial ionization anomaly.