First plasma wave observations of Uranus

Details First plasma wave observations of Uranus First plasma wave observations of Uranus

Jul 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986sci...233..106g&link_type=abstract

Science (ISSN 0036-8075), vol. 233, July 4, 1986, p. 106-109.

Physics

68

Planetary Magnetospheres, Plasma Waves, Radio Emission, Uranus Atmosphere, Voyager 2 Spacecraft, Dawn Chorus, Whistlers

Scientific paper

Plasma wave data collected by instrumentation on Voyager 2 as it passed Uranus magnetosphere are discussed. Radio signals at 31.1 and 56.2 kHz were detected 5 days from closest approach and were buried in a burst of electrostatic noise as the spacecraft crossed the bow shock 10 hr before closest approach. The noise arose from electrons escaping the bow shock into the solar wind. Electric field intensities downstream of the shock were reduced, a situation similar to those observed around Saturn and Jupiter. Whistler-mode hiss and chorus emissions were prominent within the magnetosphere at less than 8 Uranus radii, a region where particle detectors registered intense energetic electron fluxes. Also, micron-sized particle impacts at a rate of 30-50 impacts/sec occurred when passing through the ring plane. The duration of the micro-impact phase was sufficient to estimate the ring thickness as about 4000 km.

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