Fig. 8From: Statistical analysis of ionospheric total electron content (TEC): long-term estimation of extreme TEC in JapanEstimated TEC with Method I against inflation factors. The filled circle and solid line represent the estimated TEC which occur once per 10 years. The open circle and dashed line represent those of once per 100 years. The horizontal dashed line at 110 TECU indicate the once-per-10-year TEC based on 22-year TEC data set. The vertical dashed line shows the inflation factor of 3.8, which is adopted in this workBack to article page