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Official Journal of the Asia Oceania Geosciences Society (AOGS)

Fig. 2 | Geoscience Letters

Fig. 2

From: Long-term variations in the plasma sheet ion composition and substorm occurrence over 23 years

Fig. 2

a Mg II index (Bremen composite) averaged over 27 days for 1992–2015. b Plasma ion mass in the plasma sheet that is identical to Fig. 1g. Vertical orange bars denote 27-day time intervals when the minimum value of the Dst index is equal to or less than −150 nT. Vertical arrows in both panels point to a coincidence of temporal decreases in the Mg II index and the plasma ion mass around 2001 and 2014

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