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Pileup accident hypothesis of magnetic storm on 17 March 2015

We propose a \textquotedblleftpileup accident\textquotedblright hypothesis, based on the solar wind data analysis and magnetohydrodynamics modeling, to explain unexpectedly geoeffective solar wind structure which caused the largest magnetic storm so far during the solar cycle 24 on 17 March 2015: First, a fast coronal mass ejection with strong southward magnetic fields both in the sheath and in the ejecta was followed by a high-speed stream from a nearby coronal hole. This combination resulted in less adiabatic expansion tha ...

Kataoka, Ryuho; Shiota, Daikou; Kilpua, Emilia; Keika, Kunihiro;

YEAR: 2015     DOI: 10.1002/2015GL064816

coronal hole; coronal mass ejection; corotating interaction region; magnetic storm