Physics
Scientific paper
Sep 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30rssc4g&link_type=abstract
Geophysical Research Letters, Volume 30, Issue 18, pp. SSC 4-1, CiteID 1928, DOI 10.1029/2003GL017175
Physics
13
Magnetospheric Physics: Mhd Waves And Instabilities, Magnetospheric Physics: Planetary Magnetospheres (5443, 5737, 6030), Magnetospheric Physics: Plasma Waves And Instabilities, Planetary Sciences: Magnetospheres (2756)
Scientific paper
Upcoming missions such as Messenger or BepiColombo will revolutionize our knowledge about planet Mercury and its magnetosphere. To contribute to a comparison between the terrestrial and the Hermean magnetosphere the system of partial differential equations describing coupled directional and isotropic eigenmodes of a magnetosphere filled with a multi-component plasma is derived and investigated to study eigenoscillations of Mercury's magnetosphere. As anticipated eigenfrequencies are smaller, but comparable to the ion gyrofrequencies of the plasma assumed, an MHD treatment as used by Dungey [1954] is not appropriate. Instead, a cold plasma approximation is used keeping the off-diagonal components of the dielectric tensor thus allowing higher frequencies to be tackled. Unlike in the terrestrial magnetosphere, the directional and the isotropic modes in the Hermean magnetosphere remain coupled even for axisymmetric perturbations with azimuthal waves numbers m = 0.
Glassmeier Karl-Heinz
Klimushkin Dmitri Yu.
Mager Pavel N.
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