DUST MEASUREMENTS AT HIGH ECLIPTIC LATITUDES

Along Ulysses' path from Jupiter to the south ecliptic pole, the onboard dust detector measured a dust impact rate that varied slowly from 0.2, to 0.5 impacts per day. The dominant component of the dust flux arrived from an ecliptic latitude and longitude of 10 degrees +/- 10 degrees and 280 degrees +/- 30 degrees which indicates an interstellar origin. An additional flux of small particles, which do not come from the interstellar direction and are unlikely to be zodiacal dust grains, appeared south of -45 degrees latitude. One explanation is that these particles are beta-meteoroids accelerated away from the sun by radiation pressure and electromagnetic forces.