Strong interplanetary field enhancements at Ulysses-evidence of dust trails' interaction with the solar wind?

Details Strong interplanetary field enhancements at Ulysses-evidence of dust trails' interaction with the solar wind? Strong interplanetary field enhancements at Ulysses-evidence of dust trails' interaction with the solar wind?

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003icar..166..297j&link_type=abstract

Icarus, Volume 166, Issue 2, p. 297-310.

Other

6

Solar Wind, Interplanetary Medium, Interplanetary Dust, Comets

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, sometimes thorn-shaped profile, and last from minutes to hours. 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. A survey is presented of strong events of this type detected by the Ulysses spacecraft from 1990 to late 2001. Most of the events are accompanied by a discontinuity in the field direction near the events' centres. Other discontinuities are often symmetrical about the enhancement. The majority of events last less than two hours. When examined as a whole, the events tend to be accompanied by subtle changes in some plasma parameters. The majority of the enhancements are accompanied by magnetic holes on their fringes. The enhancements' occurrence rate increases with decreasing heliocentric distance. Possible formation mechanisms are discussed. No link was found with solar, or solar wind sources. Several aspects of the survey results are consistent with an origin related to cometary dust trails. Possible processes associated with a dust-solar wind interaction are discussed.

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