Astronomy and Astrophysics – Astronomy
Scientific paper
May 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989jgr....94.5255d&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 94, May 1, 1989, p. 5255-5263.
Astronomy and Astrophysics
Astronomy
15
Uranus, Solar Wind, Emissions, Radio Waves, Bursts, Source, Origin, Rotation, Pra Instrument, Pws Instrument, Voyager 2 Mission, Structure, Spacecraft Observations, Modulation, Periodicity, Magnetic Pole, Plasma, Polar Regions, Timescale, Polarization, Density
Scientific paper
Several days prior to the Voyager spacecraft encounter with Uranus, the plasma wave and radio astronomy receivers detected extraordinarily narrowband bursty signals, the first indication of any radio emission from the planet. The characteristics of these signals were so unusual that their identity as a natural planetary emission was questioned at first. Subsequent analysis has shown, however, that the n bursts are modulated at the 17.24-hour Uranus rotation period and are, therefore, planetary in origin. It is shown, in addition, that the typical bandwidth and time scale for the bursts are about 5 kHz and 250 ms, respectively. The phase of the rotation modulation suggests a probable source for these events in the vicinity of the north (weak) magnetic pole. The waves are right-hand polarized and are therefore emitted in the extraordinary magnetoionic mode if the emission in fact originates above the north magnetic pole.
Desch Michael D.
Kaiser Michael L.
Kurth Willaim S.
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