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| Titel |
Compressible coherent structures at ion scales in the solar wind turbulence |
| VerfasserIn |
André Mangeney, Olga Alexandrova, Virgile Rakoto, Filippo Pantellini, Arnaud Zaslavsky, Denise Perrone, Milan Maksimovic, Karine Issautier |
| 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 |
250095353
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| Publikation (Nr.) |
 EGU/EGU2014-10801.pdf |
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| Zusammenfassung |
| The nature of solar wind turbulence around plasma kinetic scales is still under debate. It is
known that in a neighborhood of the ion scales, the spectral shape changes and fluctuations
become more compressible. Here we present for the first time a multi-satellite analysis of
compressible coherent structures around the ion spectral break. We detect a certain
number of soliton-like one-dimensional structures. Most of the structures appear to be
two-dimensional. Generally, the structures propagate quasi-perpendicular to the mean field.
Estimated velocity in the plasma frame can be finite. The mean spatial scale is
determined to be -ă250 km, which is of the order of 20 ion inertial lengths or 5 ion
Larmor radius for the analyzed time interval in the slow solar wind. It is known that
in usual fluid turbulence most of the energy dissipation happens within coherent
structures. Our observations in the solar wind provide constraints on theoretical
modeling of small scale turbulence and dissipation in collisionless magnetized plasmas. |
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