Other
Scientific paper
Jan 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992phdt........24c&link_type=abstract
Ph.D. Thesis California Univ., Los Angeles.
Other
Earth Magnetosphere, Field Aligned Currents, Geomagnetism, Magnetosphere-Ionosphere Coupling, Current Density, Current Sheets, International Sun Earth Explorer 1, International Sun Earth Explorer 2, Magnetic Field Reconnection, Night
Scientific paper
Field-aligned currents (FAC's) play a major role in the solar wind-magnetospheric interaction by electrodynamically coupling magnetospheric and ionospheric plasmas, so that stresses applied to the outer magnetospheric plasma are transmitted to the ionosphere and ultimately to the upper atmosphere. FAC's have been studied extensively since 1967 and all of our knowledge and understanding of this coupling mechanism is based on data from low altitude polar orbiting satellites. The purpose of this dissertation is to address some of the questions related to the persistence of magnetospheric FAC's during low levels of geomagnetic activity, their motion throughout the magnetosphere and their possible source mechanisms. We detrend and rotate ISEE-1 and 2 magnetometer data into a field-aligned coordinate system using the Tsyganenko (1987) magnetic field model in order to identify current sheet crossings. We calculate the properties of the FAC's to include their current intensity, density, velocity and thickness and discuss the technique used to extrapolate those properties to the ionosphere. We also determine the location and orientation of the FAC's as well as a measure of how closely they resemble sheets of current. We identify two types of FAC's in the magnetosphere; one that is quasi-stationary and another that is moving quickly so that it is observed simultaneously by the spacecraft. The quasi-stationary FAC's are magnetospheric extensions of the low altitude region 1 and 2 currents while the fast moving FAC's are possibly current carrying waves and/or transient phenomena. Both currents are highly responsive to geomagnetic activity with the fast moving currents responding strongly to high activity. During periods of quiet activity, magnetospheric FAC's are infrequently observed except for a region on the dusk night side from mid to high L-values suggesting that global convection does drive the dusk FAC's but that the three dimensional current system is non existent on the dawn side. We also examine the night side quasi-stationary FAC's with respect to substorm phase and find that when classified as a region 1 or 2 sense current, the night side region 2 currents are responsive to internal magnetospheric stresses due to night side reconnection whereas the night side region 1 currents are responsive to variations in the stress assiciated with both day side and night side reconnection.
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