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| Titel |
Quantitative multi-spacecraft observation of magnetic cloud erosion by magnetic reconnection during propagation. |
| VerfasserIn |
Alexis Ruffenach, Benoit Lavraud, Matthew J. Owens, Jean-André Sauvaud, Neel Savani, Alexis Rouillard, Andrea Opitz, Janet G. Luhmann, Christopher T. Russell |
| Konferenz |
EGU General Assembly 2011
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 13 (2011) |
| Datensatznummer |
250052889
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| Zusammenfassung |
| Magnetic clouds, a subset of interplanetary coronal mass ejections, are characterized by a
twisted magnetic flux rope topology. During propagation, the structure interacts with its
environment and may thus at least partially reconnect, potentially eroding away part of the
original magnetic cloud flux impinging on Earth. In the present study, we quantitatively
analyse the complex interaction that occurred between a magnetic cloud (MC), the solar wind
ahead of it, and a trailing high-speed stream observed by STEREOA, B and ACE. We first
determine the orientation of the flux rope using different methods at the different spacecraft.
We then estimate the amount of eroded magnetic flux, and associated errors, based on the
observation of azimuthal flux imbalance during the spacecraft sampling of the flux rope. We
show that small deviations in cloud axis determinations have a large impact on
the estimated eroded flux. However, the combination of careful error analyses,
combined with other signatures observed in the data (e.g., at the front and rear of the
magnetic cloud) permit to demonstrate the occurrence of erosion with confidence. |
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