Survey of transient magnetic field events in the dayside magnetosphere

Details Survey of transient magnetic field events in the dayside magnetosphere Survey of transient magnetic field events in the dayside magnetosphere

Jul 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992jgr....9710677k&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 97, no. A7, July 1, 1992, p. 10,677-10,692. Research supported by NASA.

Physics

34

Ampte (Satellites), Earth Magnetosphere, Flux Transfer Events, Magnetic Variations, Momentum Transfer, Solar Wind, Apogees, Daytime, Interplanetary Magnetic Fields, Magnetopause, Magnetosheath, Solar Terrestrial Interactions, Statistical Analysis

Scientific paper

Data acquired with AMPTE/CCE are employed to investigate transient magnetic field events (TMFEs) in the dayside magnetosphere. TMFEs are found to occur more frequently near the magnetopause than deep in the magnetosphere, and the amplitude of a TMFE increases as the spacecraft comes closer to the magnetopause. It is inferred that they are generated at the magnetopause. From the MLT dependence of the rotational polarity of the transverse magnetic field perturbation, it is suggested that TMFE structures move longitudinally away from the noon meridian. Latitudinal motion away from the equator is also inferred from the latitudinal dependence of the occurrence rates of the standard and reverse events. The motion of TMFEs is tailward in both azimuthal and north-south directions. It is suggested that TMFEs carry oppositely directed twin field-aligned currents, separated in the direction perpendicular to the direction of motion and having the same current intensity.

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