Generation of a few mHz compressional modes in the magnetosphere

Details Generation of a few mHz compressional modes in the magnetosphere Generation of a few mHz compressional modes in the magnetosphere

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsm11b1751l&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #SM11B-1751

Physics

Plasma Physics

[2752] Magnetospheric Physics / Mhd Waves And Instabilities, [2784] Magnetospheric Physics / Solar Wind/Magnetosphere Interactions, [7827] Space Plasma Physics / Kinetic And Mhd Theory, [7836] Space Plasma Physics / Mhd Waves And Instabilities

Scientific paper

Ground-based observations often show that relatively low frequency Pc5 waves are found in the magnetosphere, which appear over a wide range of latitudes and indicate the nature of compressional MHD modes. In addition to previous model of waveguide theory, we have developed an extended MHD model to study a few mHz ULF waves. This model allows hot plasma in the magnetospheath, mode conversion at Alfven and cusp MHD resonances, and realistic radial profiles from the inner-magnetosphere to the solar wind. Our results suggest that a few mHz compressional modes are excited by the solar wind variations with relatively long wavelength sources. The boundaries at the magnetospheath provide compressiona mode resonances, which are consistent with the previous waveguide scenario. By adopting the invariant imbedding method (IIM), we calculate the compressional wave transmission into the magnetosphere and its mode conversion at both Alfven and cusp resonances in realistic profiles in an exact manner.

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