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
Received 20 April 1998 / Accepted 10 June 1998
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 ) 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
This article contains no SIMBAD objects.
© European Southern Observatory (ESO) 1999
Online publication: December 16, 1998