Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990nvrs.book.....c&link_type=abstract
Unknown
Astronomy and Astrophysics
Astronomy
Brightness Distribution, Image Processing, Plasmasphere, Radio Astronomy, Radio Observation, Spectrograms, Uranus (Planet), Algorithms, Dithers, Emission Spectra, High Resolution, Planetary Rotation, Voyager Project
Scientific paper
New, high-resolution spectrograms of the Voyager-2 radio observations at Uranus were produced from the original, six-second Planetary Radio Astronomy (PRA) data and these show a number of new features which were not obvious in previous versions. Among these new features are the detailed structure of the so-called broadband-bursty (b-bursty) emissions, unexpected sloping striations in the smooth high-frequency (SHF) component, and the overlap of these two components during the first rotation after closest approach. In addition, a slightly different planetary rotation rate from the b-bursty emissions, was found, and at the initial onset of the SHF component, what appears to be the shadow of a Uranian plasmasphere. These new spectrograms were prepared using a special dithering algorithm to show signal strengths as gray shadings, and the data were also manually cleaned to suppress noise and interference. This produced spectrograms of exceptional quality and certain details of their production on a stand-alone personal computer are also discussed.
Calvert Wesley
Tsintikidis Dimitri
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