Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995a%26a...295..782b&link_type=abstract
Astronomy and Astrophysics, v.295, p.782
Astronomy and Astrophysics
Astrophysics
8
Planets: Jupiter, Radio Continuum: Solar System
Scientific paper
We report on the analysis of Jovian millisecond radio bursts (S-bursts) observed at the radio station Graz-Lustbuehel on 4 January 1993 and simultaneously recorded at two other stations Nancay in France and Kharkov in Ukraine. The three radiotelescopes are separated in longitude by approximately 15deg, but located at nearly the same northern latitude (=~48deg). This network allows us to use different receivers with complementary characteristics (multichannel, spectro-analyser, spectro-polarimeter). At the Lustbuehel Observatory we have recorded the Jovian S-bursts with high time resolution of 2ms, sufficient to see the individual S-bursts and to study their phenomenology. The high resolution spectra permitted us to analyse more than 900 S-bursts, in particular the drift-rate being determined at around -33MHz/s, on average. On the other hand, from the Nancay (France) data we distinguished fifteen S-burst patterns during half an hour with mainly right-hand polarization, in the frequency range 15MHz to 31MHz. If we take into account the spectra of different S-bursts (Riihimaa 1991) we find that the drift of the S-burst pattern is a function of the structure, like the type b and type f. We have concluded that the source emissions of an S-burst pattern with positive and negative drift seem to be different. Concerning the existence of correlation between the S- and L- bursts a confirmation is shown with respect to previous works.
Boudjada Mohammed Y.
Ladreiter Hans Peter
Rucker Helmet O.
Ryabov Boris P.
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