A New Class of Complex Ejecta Resulting from the Interaction of two CMEs and its Expected Geoeffectiveness

Abstract

A significant portion of transients measured by spacecraft at 1 AU does not show the well-defined properties of magnetic clouds (MCs). Here, we propose a new class of complex, non-MC ejecta resulting from the interaction of two CMEs with different orientation, which differ from the previously studied multiple-MC event. At 1 AU, they are associated with a smooth rotation of the magnetic field vector over an extended duration and do not show clear signs of interaction. We determine the characteristics of such events based on a numerical simulation and identify and analyze a potential case in the long-duration CME measured in situ in 2001 March 19-22. Such events may result in intense, long-duration geo-magnetic storms, with sawtooth events, and may sometimes be misidentified as isolated CMEs.

Accepted to GRL; 5 pages, slightly different figures in print version

References in corpus (2)

• Super-elastic Collision of Large-scale Magnetized Plasmoids in The Heliosphere
• Linking two consecutive nonmerging magnetic clouds with their solar sources

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