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Table 1 Longitude ranges and magnetic declinations in the seven longitude sectors

From: Correlation between the global occurrences of ionospheric irregularities and deep atmospheric convective clouds in the intertropical convergence zone (ITCZ)

Region Longitude range Magnetic declination
Africa 10° to 40° E Approximately 0°
Indian 60° to 100° E Approximately 0°
West Pacific 110° to 150° E Approximately 0°
Central Pacific 160° E to 160° W Approximately +10°
East Pacific 100° to 140° W Approximately +10°
South America 45° to 75° W Approximately -20°
Atlantic 10° to 40° W Approximately -15°