 |
| Titel |
On the Existence of the Kolmogorov Inertial Range in the Terrestrial Magnetosheath Turbulence |
| VerfasserIn |
Shiyong Huang, Fouad Sahraoui, Lina Hadid, Zhigang Yuan |
| Konferenz |
EGU General Assembly 2016
|
| Medientyp |
Artikel
|
| Sprache |
en
|
| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 18 (2016) |
| Datensatznummer |
250127087
|
| Publikation (Nr.) |
 EGU/EGU2016-6911.pdf |
|
|
|
|
|
| Zusammenfassung |
| In solar wind, it is well established that at MHD scales the magnetic energy spectra generally
follow the so-called Kolmogorov inertial range spectrum f−5∕3 in solar wind. In this study,
we used three years data from the Cluster mission to statistically investigate the existence of
the Kolmogorov inertial range in the whole magnetosheath, including flanks and subsolar
regions. Statistical results show that Kolmogorov inertial range is not ubiquitous in the
magnetosheath. Indeed, most spectra were found to be shallower than the Kolmogorov one
and have a scaling ∼ f−1recalling the energy containing scales of solarwind turbulence. The
Kolmogorov scaling is observed only faraway from the bow shock and in the flanks region.
These results suggest that random-like fluctuations are generated behind the shock, which
reach a fully developed turbulence state only after some time corresponding to their
propagation (or advection) away from the shock. These fluctuations are shown to be
essentially compressible and not Alfvenic as in the case of the solar wind. Implications
on the new theoretical modeling of space plasma turbulence will be discussed. |
|
|
|
|
|
|