Transient response model of Pi 2 pulsations
Journal Article
·
· J. Geophys. Res.; (United States)
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 ionsphere 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 Pederson 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.
- Research Organization:
- Geophysical Institute, University of Alaska, Fairbanks, Alaska 99701
- OSTI ID:
- 6573791
- Journal Information:
- J. Geophys. Res.; (United States), Journal Name: J. Geophys. Res.; (United States) Journal Issue: A9 Vol. 87:A9; ISSN JGREA
- Country of Publication:
- United States
- Language:
- English
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