Physics
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsm53a1351f&link_type=abstract
American Geophysical Union, Fall Meeting 2009, abstract #SM53A-1351
Physics
[2744] Magnetospheric Physics / Magnetotail, [2752] Magnetospheric Physics / Mhd Waves And Instabilities
Scientific paper
The magnetotail is known to support various low frequency oscillations. Eigenmodes of the current sheet contributes to these oscillations. The theoretical prediction of MHD eigenmodes in a 1D Harris-type current sheet was already performed by Fruit et al. (JGR 2002, 2004) and comparison with some Cluster oscillations showed a good agreement. The present work aims to complete and extend the investigations of MHD propagation in a current sheet by adding a transversal component Bz to background magnetic field. The real magnetotail is indeed fully 2D and the role of a Bz on the propagation of MHD eigenmodes is not fully known. Using a numerical model the linear response of the current sheet to a pressure burst is computed. The results show that (1) MHD eigenmodes propagate much less efficiently in a 2D magnetotail than in a pure 1D sheet and (2) they carry much less energy. An another application to the 2D current sheet is to consider the propagation of MHD fluctuations along the magnetotail with magnetic singularities such as X- or O-points. If the Bz component that surrounds the magnetic null is strong enough, the fluctuations are reflected by the singular point and do not propagate through.
Fruit G.
Louarn Ph.
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