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Maximum Coronal Mass Ejection Speed as an Indicator of Solar and Geomagnetic Activities
Kilcik et al. 2011 The Astrophysical Journal 727 44.
Caption: Figure 2.
Comparison of monthly geomagnetic Ap and Dst (dotted) indices. For display purposes the sign of the Dst index was reversed.
© 2011. The American Astronomical Society. All rights reserved.