Physics
Scientific paper
Feb 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995jgr...100.1847z&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 100, no. A2, p. 1847-1856
Physics
3
Energetic Particles, Field Aligned Currents, Magnetic Storms, Magnetohydrodynamics, Magnetosheath, Solar Flares, Flux Density, Geosynchronous Orbits, Ion Temperature, Magnetic Fields, Maxwell Equation, Perturbation
Scientific paper
This paper puts together several aspects of the substorm phenomena into a scenario subject to quantitative analysis, based on Ampere's law, magnetic stresses, and the effect of the parallel electric field. As the magnetospheric convection continuously shears the magnetic field, the parallel electric field suddenly switches on when the shear reaches a critical value. The parallel electric field not only accelerates the charged particles to cause the auroral display but also partially decouples the ionosphere from the magnetosphere so that the magnetospheric convection is enhanced significantly, causing the substorm expansion phase. Pi 2 pulsations are excited by the change of the magnetosphere-ionosphere coupling. We show a direct relationship between the parallel potential drop, the enhanced convection rate, and the amplitude of the Pi 2 pulsations. With no adjustable parameter, the relationship shows quantitative agreement with the diverse observations.
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