Conjugate Studies of Magnetopause Surface Waves

Details Conjugate Studies of Magnetopause Surface Waves Conjugate Studies of Magnetopause Surface Waves

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsm31b1531p&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #SM31B-1531

Physics

[2724] Magnetospheric Physics / Magnetopause And Boundary Layers, [2736] Magnetospheric Physics / Magnetosphere/Ionosphere Interactions

Scientific paper

The coast phase "string-of-pearls" configuration of the five THEMIS spacecraft facilitated the direct reconstruction of the magnetopause (MP) motion. Herewith a statistical analysis of the MP oscillation frequencies could be performed. The resulting spectrum exhibits maxima at some prominent (sometimes called "magic") frequencies, at which ultra-low frequency geomagnetic pulsations are observed with increased probability of occurrence in ground-based and ionospheric measurements. In general, this set of frequencies is attributed to magnetospheric cavity or waveguide modes; our findings suggest, however, that the MP is able to support itself eigenoscillations via standing Alfvénic surface or Kruskal-Schwarzschild waves. These waves should not only become noticeable in MP motion, but also in periodic fluctuations of other observable quantities, for instance plasma flow velocity, magnetic and electric fields, in the vicinity of the MP. Additionally, these fluctuations are expected to coincide temporally with cusp latitude ground magnetic field signatures of Alfvén wave associated field aligned currents closing in the ionosphere. Hence, we present conjugate studies of THEMIS spacecraft and CARISMA (www.carisma.ca) ground-based measurements contrasting observations with theory to further investigate the development of Aflvénic MP surface waves.

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