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| Titel |
MHD turbulence in the solar wind: highlights on the effects of expansion |
| VerfasserIn |
Andrea Verdini, Roland Grappin, Wolf Christian Müller, Simone Landi, Petr Hellinger, Lorenzo Matteini, Luca Franci, Marco Velli |
| Konferenz |
EGU General Assembly 2015
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 17 (2015) |
| Datensatznummer |
250110825
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| Publikation (Nr.) |
 EGU/EGU2015-10865.pdf |
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| Zusammenfassung |
| Properties of solar wind fluctuations are often interpreted as those of a homogenous turbulent
plasma, at MHD or ion scales. However solar wind turbulence is not homogenous, being
embedded in a spherically expanding flow of approximately constant speed. We briefly
review some of the recent results on MHD turbulence obtained with the Expanding Box
Model (EBM), which reveal the influence of expansion on the spectral anisotropy, the
component anisotropy, and the z+/z- imbalance. We then focus on structure functions,
computed in frames attached to the local or global mean field, and show that most of the
observed features are well reproduced in our EBM simulations. We finally comment on the
role of expansion in determining the injection scale of solar wind turbulence and its
anisotropy. |
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