Interplanetary Field Enhancements at Ulysses

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2129 Interplanetary Dust, 2134 Interplanetary Magnetic Fields, 2152 Pickup Ions, 6015 Dust, 6025 Interactions With Solar Wind Plasma And Fields

Scientific paper

Interplanetary field enhancements were first discovered in the vicinity of Venus. These events are characterised by an increase in the magnitude of the heliospheric magnetic field with a near-symmetrical, thorn-shaped profile, and last from minutes to hours. Most of the events are accompanied by a discontinuity in the field direction near the events' centres. Surveys of the events near Venus and Earth indicated clustering of the events in inertial space, which suggested that their sources were solar system objects other than the Sun. We present a survey of such events detected to date by the Ulysses spacecraft, including the strongest known event, detected at 3~AU from the Sun. The spatial distribution of the events and the conclusions drawn from this distribution are presented. We discuss possible formation mechanisms, including the original suggestion of a cometary cause, and the distortion of the solar wind by the presence of dust particles.

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