Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006iaujd..12e..29l&link_type=abstract
Long Wavelength Astrophysics, 26th meeting of the IAU, Joint Discussion 12, 21 August 2006, Prague, Czech Republic, JD12, #29
Astronomy and Astrophysics
Astrophysics
Scientific paper
In the given work the variety of fine, superfine and modulation structures of the Jovian decametre radioemission were presented and discussed. Serious investigations of these events is an actual radio astronomical task, potentially capable to determining characteristic features of the emission and of developing a detailed radiation mechanism which describes a maximum number of observed parameters. Depending on the time and frequency resolution achieved in the experiment as well as on the visualization time scale, different features of the radiation spectra can be stressed. The wide-band data taken for the present analysis have been obtained with the high frequency and time resolution equipment of a Digital Spectropolarimeter and a Waveform Receiver installed into the world's largest decametre band radio telescope UTR-2 (Kharkov, Ukraine). The behaviour of the so called "modulation lanes" was investigated, and it was firstly confirmed that they always appear on the scale of minutes when the data time resolution is about 100 ms, and the curvature of positive and negative drifting lanes are differ. As intriguing kind of spectrum modulation was found over the scale of ten seconds, viz. three separated quasi-harmonic structures of the different frequency bands. Frequency modulation events are also founded and analyzed. By the processing the data with a millisecond resolution in the wavelet analysis technique it was also opened a short-pulse content of the individual simple S-burst, which also seems to be a result of some kind of modulation effects. Polarization properties of the modulation lanes in the theory of the "interference screen" model have been considered. The obtained results may prove useful for future studies of the still unclear origin of the sporadic Jovian decametre emission.
Konovalenko Aleksander
Lecacheux Alain
Lytvynenko G. V.
Rucker Helmet O.
Shaposhnikov Vladimir E.
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