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Astron. Astrophys. 341, 918-927 (1999)


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Drift of jovian S-burst inferred from adiabatic motion in a parallel electric field

P.H.M. Galopeau 1, M.Y. Boudjada 2 and H.O. Rucker 2

1 Centre d'Étude des Environnements Terrestre et Planétaires, CNRS/UVSQ, 10-12, Avenue de l'Europe, F-78140 Vélizy, France
2 Space Research Institute, Austrian Academy of Sciences, A-8010 Graz, Austria

Received 20 April 1998 / Accepted 10 June 1998

Abstract

We study the effect of a parallel electric field on the adiabatic motion of electrons trapped in the Io flux tube and we derive the frequency drift rate of the S-bursts emitted at the gyrofrequency. The magnetic field model is a dipole and the cyclotron maser instability is the mechanism responsible for the emission. It appears that weak values of the electric field (a few [FORMULA]) may change drastically the frequency range and drift rate of the bursts. We propose an individual fitting of certain types of S-bursts, in particular the types a, r, f of Riihimaa's classification, by a curve depending only on the energy and the pitch angle at the equator and on the value of the parallel electric field.

Key words: radiation mechanisms: non-thermal – planets and satellites: individual: Io – planets and satellites: individual: Jupiter – radio continuum: solar system

Send offprint requests to: P.H.M. Galopeau

Correspondence to: Patrick.Galopeau@cetp.ipsl.fr

© European Southern Observatory (ESO) 1999

Online publication: December 16, 1998

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