 |
| Titel |
A nonextensive entropy path to probability distributions in solar wind turbulence |
| VerfasserIn |
M. P. Leubner, Z. Vörös |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1023-5809
|
| Digitales Dokument |
URL |
| Erschienen |
In: Nonlinear Processes in Geophysics ; 12, no. 2 ; Nr. 12, no. 2 (2005-02-01), S.171-180 |
| Datensatznummer |
250010480
|
| Publikation (Nr.) |
 copernicus.org/npg-12-171-2005.pdf |
|
|
|
|
|
| Zusammenfassung |
| The observed scale dependence of the probability distributions of the
differences of characteristic solar wind variables is analyzed.
Intermittency of the turbulent fluctuations at small-scale spatial
separations is accompanied by strongly non-Gaussian distributions
that turn into a normal distribution for large-scale separation.
Conventional theoretical models are subject to insufficient
physical justification since nonlocality in turbulence should be
based on long-range interactions, provided recently by the bi-kappa
distribution in the context of nonextensive thermo-statistics.
Observed WIND and ACE probability distributions are accurately
reproduced for different time lags by the one-parameter bi-kappa
functional, a core-halo convolution, where kappa measures the degree
of nonlocality or nonextensivity in the system. Gradual decoupling is
obtained by enhancing the spatial separation scale corresponding to
increasing kappa values, where a Gaussian is approached for infinite
kappa. Consequently, long-range interactions introduced on the
fundamental level of entropy generalization, are able to provide
physically the source of the observed scale dependence of the
turbulent fluctuations in the intermittent interplanetary medium. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|