A transient response model of Pi 2 pulsations

Details A transient response model of Pi 2 pulsations A transient response model of Pi 2 pulsations

Sep 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982jgr....87.7483k&link_type=abstract

Journal of Geophysical Research, vol. 87, Sept. 1, 1982, p. 7483-7488.

Physics

31

Geomagnetic Micropulsations, Ionospheric Currents, Ionospheric Propagation, Magnetohydrodynamic Waves, Transient Response, Field Aligned Currents, Ionospheric Disturbances, Magnetic Disturbances

Scientific paper

A transient response model of Pi 2 pulsations due to an enhanced convection in the plasma sheet is presented. A nonlinear Alfven wave is launched by the enhanced convection electric field. The reflection coefficient at the ionosphere is derived by matching the field-aligned current of the Alfven wave to the field-aligned current from the divergence of the ionospheric Hall and Pedersen currents. The resulting transient magnetic perturbation on the ground exhibits the characteristics of the Pi 2 pulsation signature accompanying a substorm onset. The predicted fundamental period of the magnetic perturbation is 4 times the one-way Alfven travel time which increases toward higher latitude. The predicted Pi 2 source regions in the ionosphere are in reasonable agreement with observations.

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