Steady state excitation of field line resonances by global waveguide modes in the magnetosphere

Details Steady state excitation of field line resonances by global waveguide modes in the magnetosphere Steady state excitation of field line resonances by global waveguide modes in the magnetosphere

Jul 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003jgra..108.1301t&link_type=abstract

Journal of Geophysical Research Space Physics, Volume 108, Issue A7, pp. SMP 19-1, CiteID 1301, DOI 10.1029/2003JA009935

Physics

6

Magnetospheric Physics: Mhd Waves And Instabilities, Magnetospheric Physics: Solar Wind/Magnetosphere Interactions, Magnetospheric Physics: Magnetosphere/Ionosphere Interactions

Scientific paper

A major shortcoming of theories of long-period magnetic pulsations is the separate treatment of the problems of wave excitation and resonant coupling. This could account for many substantial discrepancies between the waveguide/cavity mode theories and observations. A unified approach leading to a new type of field line resonance excitation mechanism is presented. It is shown that in a steady state the direct coupling of the waveguide modes to the local field line oscillations provides a natural and very efficient transfer of energy from the magnetosheath flow to the shear Alfvén waves deep within the magnetosphere even in the ideal magnetohydrodynamic limit. The role of ionospheric dissipation is examined, and many well-known observational features are recovered. The e-folding lengths of the generated waves are estimated. The presented mechanism of energy transport from the velocity shear into resonant Alfvén waves could play an important role in many applications of solar-terrestrial physics and astrophysics.

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