Voyager 2 at Uranus: Grain impacts in the ring plane
作者:
N. Meyer‐Vernet,
M. G. Aubier,
B. M. Pedersen,
期刊:
Geophysical Research Letters
(WILEY Available online 1986)
卷期:
Volume 13,
issue 7
页码: 617-620
ISSN:0094-8276
年代: 1986
DOI:10.1029/GL013i007p00617
数据来源: WILEY
摘要:
During the Uranus ring plane crossing at 4.57 Uranus radii, the PRA instrument aboard Voyager 2 recorded a characteristic intense noise extending 104km 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 ∼ 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 10−9cm−3of grains larger than 1 µm with a scale height ∼ 150 km across the ring plane. The distribution is asymmetrical, extending farther on the sunlit side. The inferred geometric optical depth is of
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