Drift of jovian S-burst inferred from adiabatic motion in a parallel electric field
نویسندگان
چکیده
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 μVm−1) 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.
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