Do Shocks Excite Global Cavity Mode Oscillations?

Details Do Shocks Excite Global Cavity Mode Oscillations? Do Shocks Excite Global Cavity Mode Oscillations?

May 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agusmsm51b..09s&link_type=abstract

American Geophysical Union, Spring Meeting 2002, abstract #SM51B-09

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2740 Magnetospheric Configuration And Dynamics, 2752 Mhd Waves And Instabilities, 2784 Solar Wind/Magnetosphere Interactions

Scientific paper

Occasionally, magnetospheric ULF waves occur at multiple discrete frequencies. During these times, distinct peaks are observed in magnetic field power spectra at frequencies below a few mHz. Models treating the magnetosphere like a cavity or as a wave guide, excited by solar wind shocks or impulses, can theoretically reproduce such observations. In these models, the shape and internal properties of the magnetosphere determine the resonant wave characteristics. Recently, Kepko et al. (2002) have presented an alternative mechanism to the "cavity mode" hypothesis. They have shown cases in which variations of the solar wind dynamic pressure, possessing multiple discrete frequencies can directly drive global magnetospheric oscillations at these same multiple, discrete frequencies. In this paper, we explore whether shocks and other impulsive dynamic pressure variations excite cavity mode oscillations, or, whether magnetospheric ULF waves are driven directly by the solar wind.

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