High-velocity Electromagnetically Interacting Dust Streams at Jupiter: the Ulysses Perspective

Details High-velocity Electromagnetically Interacting Dust Streams at Jupiter: the Ulysses Perspective High-velocity Electromagnetically Interacting Dust Streams at Jupiter: the Ulysses Perspective

Sep 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006dps....38.3503k&link_type=abstract

American Astronomical Society, DPS meeting #38, #35.03; Bulletin of the American Astronomical Society, Vol. 38, p.547

Astronomy and Astrophysics

Astronomy

Scientific paper

One of the most intriguing discoveries of the Ulysses mission so far has been the detection of periodic, collimated burst-like streams of high velocity, submicron-sized dust particles during the spacecraft's encounter with Jupiter in 1992. A total of eleven dust streams were measured during Ulysses' first encounter with Jupiter within 2 AU of the planet. The streams occurred at approximately monthly intervals (28 +/- 3 days) which was a complete surprise because no periodic phenomenon was known before for small dust grains in interplanetary space. In February 2004 Ulysses had its second flyby at Jupiter at 0.8 AU distance from the planet. 28 dust streams emanating from the jovian system were measured between November 2002 and August 2005 while the spacecraft was within 4 AU of the planet, scanning jovigraphic latitudes from +75 to -25 degrees. The highest dust fluxes were measured in mid-2004 at the passage of the equatorial plane of the planet when more than 2000 impacts per day were measured. The grain impact direction is correlated with the polarity and strength of the interplanetary magnetic field. At high jovigraphic latitudes, the impact rates show a periodicity of 26 days, closely matching the solar rotation period, while at the jovian equator the streams fluctuate with twice this period. The 14-day subharmonic streams alternate in arrival direction and are correlated with the pointing of the interplanetary magnetic field.

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