Generation of Alfven waves by deceleration of magnetospheric convection and broadband Pi pulsations

Details Generation of Alfven waves by deceleration of magnetospheric convection and broadband Pi pulsations Generation of Alfven waves by deceleration of magnetospheric convection and broadband Pi pulsations

May 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982jgr....87.3511k&link_type=abstract

Journal of Geophysical Research, vol. 87, May 1, 1982, p. 3511-3518. Research supported by the University of California

Physics

3

Earth Ionosphere, Earth Magnetosphere, Geomagnetic Pulsations, Magnetohydrodynamic Waves, Broadband, Convection, Magnetosphere-Ionosphere Coupling, Magnetospheric Instability

Scientific paper

The generation of Alfven waves by the deceleration of magnetospheric convection caused by ionospheric loading effects in the magnetospheric dynamo is considered. A one-dimensional model of that region of the plasma sheet where convection is decelerated due to the dynamo process in the magnetosphere-ionosphere coupling is formulated, and the stability of the region is analyzed in order to derive the growth rate of unstable Alfven waves. The effects of ionospheric damping on unstable Alfven wave packets bounding between hemispheres are estimated. It is found that the overall growth rate is proportional to the height-integrated Pedersen conductivity and the convection speed in the dynamic region, but changes into a damping rate when the Pedersen conductivity is reduced below a specific threshold. The unstable Alfven waves thus generated are also found to contribute to both burstlike and relatively continuous Pi pulsations observed during substorms.

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