Alfvén vortices in Saturn's magnetosheath: Cassini observations

Details Alfvén vortices in Saturn's magnetosheath: Cassini observations Alfvén vortices in Saturn's magnetosheath: Cassini observations

Aug 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008georl..3515102a&link_type=abstract

Geophysical Research Letters, Volume 35, Issue 15, CiteID L15102

Physics

2

Interplanetary Physics: Mhd Waves And Turbulence (2752, 6050, 7836), Interplanetary Physics: Planetary Bow Shocks, Magnetospheric Physics: Magnetosheath

Scientific paper

First signatures of Alfvén vortices in the Kronian magnetosheath are presented. An Alfvén vortex is a non-linear bi-dimensional magnetic structure associated with sheared magnetic field and velocity perturbations, propagating obliquely to the external magnetic field direction. Such structures have been recently discovered by Cluster in Earth's magnetosheath downstream of a quasi-perpendicular bow-shock at scales close to 10c/ω pi (where c is the speed of light and ω pi the ion plasma frequency). The presence of Alfvén vortices downstream of a quasi-perpendicular bow-shock of Saturn with comparable scales to the ones at Earth indicates the universality of this phenomenon. It suggests that such non-linear structures are an inherent property of plasma flow downstream of collisionless shock waves, which can have broad astrophysical applications.

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