Field reversing magnetotail current sheets: Earth, Venus, and Comet Giacobini-Zinner

Details Field reversing magnetotail current sheets: Earth, Venus, and Comet Giacobini-Zinner Field reversing magnetotail current sheets: Earth, Venus, and Comet Giacobini-Zinner

Sep 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986phdt........13m&link_type=abstract

Ph.D. Thesis California Univ., Los Angeles.

Statistics

Computation

Cometary Magnetospheres, Current Density, Current Distribution, Current Sheets, Earth (Planet), Earth Magnetosphere, Giacobini-Zinner Comet, Magnetic Field Configurations, Planetary Magnetospheres, Solar Wind, Venus (Planet), Computation, Data Correlation

Scientific paper

The field reversing magnetotail current sheets at Earth, Venus, and Comet Giacobini-Zinner are examined. In the near Earth study a new analysis technique is developed to calculate the detailed current density distributions within the cross tail current sheet for the first time. This technique removes the effects of a variable sheet velocity by inverting intersatellite timings between the co-orbiting satellites ISEE-1 and -2. Case studies of three relatively geomagnetically quiet crossings are made; sheet thicknesses and peak current densities are approx. 15,000 km and approx. 5.50 nA/square m. Current density distributions reveal a high density central region, lower density shoulders, and considerable fine structure throughout. In the Venus study another new analysis technique is developed to reconstruct the average tail configuration from a correlation between field magnitude and draping angle in a large statistical data set. The variability of the Venus tail data is explained in terms of flapping of the current sheet as the tail tries to maintain a pressure balance condition under variations in the upstream interplanetary magnetic field (IMF) angle and, therefore, magnetic fluxes in the two lobes. The average magnetic field configuration and consistent plasma properties are derived.

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