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| Titel |
Intermittency and Multifractal behavior in the Slow and Fast Solar Wind Beyond the Ecliptic Plane |
| VerfasserIn |
Anna Wawrzaszek, Marius Echim, Wieslaw M. Macek, Roberto Bruno |
| Konferenz |
EGU General Assembly 2016
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 18 (2016) |
| Datensatznummer |
250136498
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| Publikation (Nr.) |
 EGU/EGU2016-17547.pdf |
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| Zusammenfassung |
| In this work we study the evolution of intermittency in the solar wind magnetic turbulence at
heliocentric distances between 1.5 and 5.4 AU and at heliolatitudes between -80 and 70o. We
use the a multifractal analysis based on the partition function formalism. More precisely, we
consider magnetic field intensity for the solar wind data from Ulysses spacecraft measured
during two solar minima (1997-1998, 2007-2008) and one solar maximum (1999-2001). By
modeling multifractal spectrum we reveal intermittent character of turbulence in the
small-scale fluctuations of the magnetic field embedded in the slow and fast solar wind.
Generally, at small distances from the Sun both in the slow and fast solar wind we
observe the high degree of multifractality (intermittency) which decreases somewhat
slowly with distance and slowly with latitude. The results seem to suggest that
generally intermittency in the solar wind has solar origin. However, the fast and
slow streams, shocks and other nonlinear interaction can only be considered as the
drivers of the intermittent turbulence. It seems that analysis shows that turbulence
beyond the ecliptic plane evolves too slowly to maintain the intermittency with the
distance and latitude. Moreover, we confirm the lower level of multifractality and
intermittency than in the ecliptic, as well as the existence of symmetry with respect
to the ecliptic plane, suggesting similar turbulent properties observed in the two
hemispheres.
Research supported by the European Community’s Seventh Framework Programme |
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