Voyager 2 at Uranus - Grain impacts in the ring plane

Details Voyager 2 at Uranus - Grain impacts in the ring plane Voyager 2 at Uranus - Grain impacts in the ring plane

Jul 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986georl..13..617m&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 13, July 1986, p. 617-620.

Astronomy and Astrophysics

Astronomy

25

Grains, Interplanetary Dust, Particle Collisions, Uranus Rings, Voyager 2 Spacecraft, Collision Parameters, Electric Potential, Mass Distribution, Noise Measurement

Scientific paper

During the Uranus ring plane crossing at 4.57 Uranus radii, the Planetary Radio Astronomy instrument aboard Voyager 2 recorded a characteristic intense noise extending 10,000 km perpendicular to the ring plane. This is interpreted as due to impact ionization of dust grains striking the spacecraft. The noise level is smaller by a factor of about 170 than the same kind of event recorded during Voyager 2 Saturn encounter just outside the G-ring. The results indicate a maximum concentration of about 10 to the -9th/cu cm of grains larger than 1 micron with a scale height of about 150 km across the ring plane. The distribution is asymmetrical, extending farther on the sunlit side. The inferred geometric optical depth is of order 10 to the -8th.

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