Physics
Scientific paper
Mar 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001p%26ss...49..365q&link_type=abstract
Planetary and Space Science, Volume 49, Issue 3-4, p. 365-376.
Physics
18
Scientific paper
The bandwidth, flux density, power, energy, and polarization of Jovian S-bursts are statistically analyzed from high-resolution dynamic spectral observations performed in Nançay using an acousto-optical spectrograph. Average values and ranges of variation are derived. The Io-Jupiter-observer configuration of our observations corresponds to S-bursts with dominant right-hand elliptical polarization. We obtain a bandwidth of 0.5-9 MHz, an average flux density of 4×10-20Wm-2Hz-1 (normalized at 1 AU), and an average radiated power of ~109W. Instantaneous values cover up to 5 orders of magnitude around these averages. The S-burst flux densities are found to follow a power-law distribution, with an average index /-2, subjected to abrupt variations at a timescale of minutes. The measured circular polarization ratio is /V=-0.56, consistent with earlier measurements. Spectral variations of this polarization ratio are suggested by the observations, whose interpretation in terms of radio beaming angle is also consistent with earlier studies. The ``density'' of S-burst occurrence in the time-frequency plane is found to be /~0.3. Finally, S- and L-burst energetics are compared, and variations of S-bursts physical properties as a function of Io's longitude are searched for.
Queinnec Julien
Zarka Ph.
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