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| Titel |
Scaling exponents of the velocity structure functions in the interplanetary medium |
| VerfasserIn |
V. Carbone |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 12, no. 7 ; Nr. 12, no. 7, S.585-590 |
| Datensatznummer |
250010967
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| Publikation (Nr.) |
 copernicus.org/angeo-12-585-1994.pdf |
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| Zusammenfassung |
| We analyze the scaling exponents of the
velocity structure functions, obtained from the velocity fluctuations measured
in the interplanetary space plasma. Using the expression for the energy transfer
rate which seems the most relevant in describing the evolution of the
pseudo-energy densities in the interplanetary medium, we introduce an energy
cascade model derived from a simple fragmentation process, which takes into
account the intermittency effect. In the absence and in the presence of the
large-scale magnetic field decorrelation effect the model reduces to the fluid
and the hydromagnetic p-model, respectively. We show that the scaling
exponents of the q-th power of the velocity structure functions, as
obtained by the model in the absence of the decorrelation effect, furnishes the
best-fit to the data analyzed from the Voyager 2 velocity field measurements at
8.5 AU. Our results allow us to hypothesize a new kind of scale-similarity for
magnetohydrodynamic turbulence when the decorrelation effect is at work, related
to the fourth-order velocity structure function. |
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