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Anomalous expansion of coronal mass ejections during solar cycle 24 and its space weather implications

Gopalswamy, Nat; Akiyama, Sachiko; Yashiro, Seiji +3 more

The familiar correlation between the speed and angular width of coronal mass ejections (CMEs) is also found in solar cycle 24, but the regression line has a larger slope: for a given CME speed, cycle 24 CMEs are significantly wider than those in cycle 23. The slope change indicates a significant change in the physical state of the heliosphere, due…