Physics – Geophysics
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsm51c1414a&link_type=abstract
American Geophysical Union, Fall Meeting 2006, abstract #SM51C-1414
Physics
Geophysics
2728 Magnetosheath, 2752 Mhd Waves And Instabilities (2149, 6050, 7836), 4400 Nonlinear Geophysics (3200, 6944, 7839), 4490 Turbulence (3379, 4568, 7863)
Scientific paper
Magnetic field fluctuations in the frequency range [0.02-12.5] Hz are studied with the four Cluster satellites in the Earth magnetosheath downstream of a quasi-per\-pen\-di\-cu\-lar bow-shock. The turbulent spectrum presents a spectral break accompanied by a broad maximum usually interpreted as due to Alfvén Ion Cyclotron waves. We establish that this spectral knee corresponds to space-localized coherent magnetic structures in the form of Alfvén vortices. The Alfvén vortex is a non-linear cylindrical Alfvén wave, quasi-parallel to the mean magnetic field B0 and propagating in a plane perpendicular to B_0. The frequent observations of such structures indicate their stability in the plasma. To verify the vortex stability, two-dimensional compressible MHD simulations are performed.
Alexandrova Olga
Cornilleau-Wehrlin Nicole
Grappin Roland
Maksimovic Milan
Mangeney Andre
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