A transient-response theory of Pi 2 pulsations

Details A transient-response theory of Pi 2 pulsations A transient-response theory of Pi 2 pulsations

May 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985jgr....90.4395s&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 90, May 1, 1985, p. 4395-4397.

Physics

8

Geomagnetic Pulsations, Ionospheric Currents, Magnetic Storms, Magnetohydrodynamic Waves, Magnetospheric Instability, Transient Response, Convection, Electric Potential, Electrojets, Ionospheric Conductivity, Reflected Waves, Space Plasmas, Two Dimensional Models

Scientific paper

The cause of Pi 2 pulsations at substorm onset can be understood in terms of the transient ionospheric response to an enhanced convection in the plasma sheet. A two-dimensional model is presented to demonstrate how the transient ionospheric response can lead to damped oscillations similar to the Pi 2 pulsations observed at substorm onset. Alfven waves are launched by the enhanced convection and subsequently reflected between the ionospheres in the opposite hemisphere. The ionospheric conductivity is fully anisotropic and highly nonuniform.

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