Fig. 8From: Extreme geomagnetic activities: a statistical studyCumulative distribution function of SEP events at GOES for time interval 1976 to 2020. The data points are displayed at even intervals in logarithmic scale. Log-normal and power-law fits are shown by thick and thin solid curves, respectively. The best fitted parameters are α = 0.71, μ = 1.7, and σ = 1.2Back to article page