Observation and Analysis of Jupiter Millisecond Radiobursts

Details Observation and Analysis of Jupiter Millisecond Radiobursts Observation and Analysis of Jupiter Millisecond Radiobursts

Sep 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998baas...30.1079r&link_type=abstract

American Astronomical Society, DPS meeting #30, #32.P25; Bulletin of the American Astronomical Society, Vol. 30, p.1079

Astronomy and Astrophysics

Astronomy

Scientific paper

The Jupiter radiostation Observatory Lustbuehel, Graz, is part of the European radiostation network Kharkov (Ukraine), Graz (Austria) and Nancay (France). The separation in longitude is about 15 deg and the stations are located at nearly the same northern latitude (48 deg). This groundbased network allows the first continuous coverage of Jovian decametric radio emission over one full Jupiter rotation period. This network cooperation regards the development and realization of a new generation of radio receivers, i.e. the numerical spectro- polarimeter with high dynamic (70 dB) and high time resolution (1 ms), further the study of the phenomenology of the Jovian millisecond radio bursts which is directly connected to the progress made by the new receiver. This study permits the derivation of the observational parameters of individual bursts such as the structure within the dynamic spectrum, the drift rate, the polarization, the bandwidth, etc. A further topic is devoted to the comparison between the observational parameters and the existing models in order to explain origin and features of these bursts, called S-bursts. The adiabatic model, e.g., is insufficient to explain the instantaneous drift rate of individual structures. The incorporation of local electric fields along the Io flux tube enables a detailed analysis of individual millisecond bursts and a determination of physical parameters of the radiating electrons. Future investigations will be oriented towards the analysis of the generation mechanism, i.e. the cyclotron maser instability (CMI) and the evaluation of the growth rate taking into account the plasma, gyro- and wave frequencies, and the wave normal angle.

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