Fig. 4
From: Automatic selection of Dst storms and their seasonal variations in two versions of Dst in 50 years
Overall seasonal variations of monthly number of storms (a), and their corresponding average DstMin (b) and average ⟨DstMP⟩ (c) of the storms in Kyoto Dst (blue) and USGS Dst (red); large standard deviations of average DstMin and average ⟨DstMP⟩ resulted from combining all storms (moderate to super) in 1958–2007 together are not shown; horizontal lines represent annual means