Physics – Plasma Physics
Scientific paper
May 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999jgr...10410369o&link_type=abstract
Journal of Geophysical Research, Volume 104, Issue A5, p. 10369-10378
Physics
Plasma Physics
11
Planetology: Solid Surface Planets: Magnetospheres, Magnetospheric Physics: Mhd Waves And Instabilities, Magnetospheric Physics: Plasma Waves And Instabilities, Space Plasma Physics: Wave/Wave Interactions
Scientific paper
Mercury allows one to test the concepts of magnetospheric dynamics in a very particular region of the parameter space governing planetary magnetospheres. One of the concepts to be tested is the field line resonance, which has become a paradigm in understanding the features of ULF pulsations in the Earth magnetosphere. Unlike field line resonances in the terrestrial magnetosphere, which are entirely described in terms of magnetohydrodynamics, the high frequencies of magnetospheric eigenoscillations at Mercury require a multicomponent treatment for the plasma. The model we present for field line resonances in the Hermean magnetosphere takes into account the plasma's multi-ion character. We find that the crossover frequency, i.e., a pure multi-ion effect, is a preferred frequency for field line resonances at Mercury. This allows us to infer the local plasma composition from observations of resonant pulsations. On the basis of a ULF pulsation event recorded by Mariner 10 during one of its Mercury encounters, we thus estimate the concentration of sodium ions in Mercury's magnetospheric plasma.
Cramm Ruediger
Glassmeier Karl-Heinz
Othmer Carsten
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