Generation of macroscopic magnetic-field-aligned electric fields by the convection surge ion acceleration mechanism

Details Generation of macroscopic magnetic-field-aligned electric fields by the convection surge ion acceleration mechanism Generation of macroscopic magnetic-field-aligned electric fields by the convection surge ion acceleration mechanism

Jul 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989jgr....94.8911m&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 94, July 1, 1989, p. 8911-8920. Research supported by NASA.

Physics

26

Earth Magnetosphere, Electric Fields, Field Aligned Currents, Geomagnetism, Ion Distribution, Particle Acceleration, Convective Flow, Electric Potential, Spectrograms

Scientific paper

The 'convection surge' model for ion acceleration, designed by Mauk (1986) to explain the observed ion distributions and the field-aligned character of middle magnetospheric ion distributions during the expansion phase of a substorm, was extended to include the self-consistent generation of magnetic-field-aligned electric fields. Results from the modified model show that the convection surge mechanism leads to the generation of dynamical macroscopic magnetic field-aligned electric fields that begin their strongest developments very near the magnetic equator and then propagate to higher latitudes. Potential drops as high as 1 to 10 kV might be expected, depending on the mass species of the ions and on the electron temperatures. It is speculated that the convection surge mechanism could be a key player in the transient field-aligned electromagnetic processes observed to operate within the middle magnetosphere.

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