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| Titel |
Long-duration Ejecta Resulting from the Interaction of Two CMEs: Case Study for the 2001 March 19-22 event |
| VerfasserIn |
Noe Lugaz, Charles Farrugia |
| Konferenz |
EGU General Assembly 2014
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 16 (2014) |
| Datensatznummer |
250099515
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| Publikation (Nr.) |
 EGU/EGU2014-15304.pdf |
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| Zusammenfassung |
| A significant portion of transients measured by spacecraft at 1AU does not show the
well-defined properties of magnetic clouds (MCs). Among these non-MC ejecta, some are
thought to be associated with the interaction of successive coronal mass ejections (CMEs). A
particular focus has been on recognizing and understanding multiple-MC events, where two
MCs cross the spacecraft path one after the other with signs of interaction between
them.
Here, we discuss another type of complex ejecta resulting from the interaction of two
CMEs with different orientations, which differs from previously studied multiple-MC events.
We have combined 3-D MHD numerical simulations with the SWMF of isolated and
interacting CMEs with the analysis of in situ measurements to determine the typical
properties of such events and their expected geo-effectiveness. We focus, in particular, on the
analysis of the long-duration transient event measured in 2001 March 19–22. We find that
these events are associated with a smooth rotation of the magnetic field vector over an
extended duration and do not exhibit clear signs of interaction. Due to the long driving of
Earth’s magnetosphere, such events may result in intense, long-duration geo-magnetic
storms, with a sequence sawtooth events, and may sometimes be misidentified as isolated
CMEs. |
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