Field-aligned currents in the Jovian magnetosphere during the ULYSSES flyby

Details Field-aligned currents in the Jovian magnetosphere during the ULYSSES flyby Field-aligned currents in the Jovian magnetosphere during the ULYSSES flyby

Apr 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993p%26ss...41..291d&link_type=abstract

Planetary and Space Science (ISSN 0032-0633), vol. 41, no. 4, p. 291-300.

Computer Science

29

Birkeland Currents, Field Aligned Currents, Jupiter Atmosphere, Magnetic Field Configurations, Planetary Magnetic Fields, Planetary Magnetospheres, Magnetosphere-Ionosphere Coupling, Planetary Magnetotails, Solar Planetary Interactions, Solar Wind, Ulysses Mission, Jupiter, Currents, Magnetosphere, Spacecraft Observations, Solar Wind, Ulysses Mission, Magnetometer, Origin, Magnetic Field, Electromagnetics, Source, Analysis, Momentum, Current Sheet, Ionosphere, Comparison

Scientific paper

The data recorded by the dual vector helium/fluxgate magnetometer flown onboard the Ulysses spacecraft during the flyby of Jupiter in February 1992 are analyzed with the aim of identifying the presence of field-aligned current signatures. Field-aligned current flow is expected wherever stress is being transmitted electromagnetically along the magnetic field direction. Sources of such currents at Jupiter are departures within the magnetosphere from corotation, momentum transfer from the solar wind, or centrifugally driven magnetospheric outflow. It is pointed out that the azimuthal field component provides a simple first-order means of monitoring the presence of currents, the currents occurring in regions where the azimuthal component changes significantly. The data from both inbound and outbound passes show evidence of 'leading' and 'lagging' azimuthal field signatures where the field bends out of the meridian, and which are signatures symptomatic of current systems associated with departures from corotation. On the outbound pass, the most intense signatures are found where the field switches from a configuration symptomatic of the field lagging corotation to a configuration representing the field leading. The latter configuration also corresponds to a tail-like displacement of the field and, indeed, the magnetometer data alone cannot distinguish the source of the current system, which could be due to solar wind magnetosphere coupling or which may arise from internal stress imbalance.

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