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Pileup accident hypothesis of magnetic storm on 17 March 2015


AuthorKataoka, Ryuho; Shiota, Daikou; Kilpua, Emilia; Keika, Kunihiro;
Keywordscoronal hole; coronal mass ejection; corotating interaction region; magnetic storm
AbstractWe 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 than usual to keep the high speed, strong magnetic field, and high density within the coronal mass ejection. Second, preceding slow and high-density solar wind was piled up ahead of the coronal mass ejection just before the arrival at the Earth to further enhance its magnetic field and density. Finally, the enhanced solar wind speed, magnetic field, and density worked all together to drive the major magnetic storm.
Year of Publication2015
JournalGeophysical Research Letters
Volume
Number of Pages
Section
Date Published07/2015
ISBN
URLhttp://doi.wiley.com/10.1002/2015GL064816
DOI10.1002/2015GL064816