Fig. 1From: Diagnosing low-/mid-latitude ionospheric currents using platform magnetometers: CryoSat-2 and GRACE-FOData coverage as a function of MLT and day-of-year for a CryoSat-2 and b GRACE-FO. Borders for different seasons are given as annotations on the right-hand side. The ‘MAG4′ in the title of the top panel signifies a combined solution of B-field from the three magnetometers onboard CryoSat-2Back to article page