The source of the Jupiter S-bursts

Details The source of the Jupiter S-bursts The source of the Jupiter S-bursts

Jan 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980natur.283...48e&link_type=abstract

Nature, vol. 283, Jan. 3, 1980, p. 48-50. Research supported by the Australian Research Grants Committee.

Astronomy and Astrophysics

Astronomy

4

Io, Jupiter (Planet), Planetary Radiation, Radio Bursts, Very High Frequencies, Cyclotron Resonance, Doppler Effect, Electromotive Forces, Electron Energy, Magnetic Flux, Planetary Ionospheres, Radio Sources (Astronomy), Jupiter, S-Waves, Bursts, Satellites, Io, Wavelengths, Models, Electrons, Magnetic Fields, Flux Tubes, Current, Flow, Data, Electromagnetic Wave Transmission, Electromagnetic Radiation, Ionosphere, Bandwidths, Acceleration, Observations, Techniques

Scientific paper

The origin of the transient radio S-bursts from Jupiter by the interaction of the planetary magnetic flux tube intersecting Io with the electromotive force generated by the motion of Io across the Jovian magnetic field is considered. The energies of the electrons presumed to be responsible for the bursts by emitting Doppler cyclotron radiation as they travel up the flux tube are determined from the rate of change of wave frequency with time, and are found to vary with the system III longitude of Io. Longitude and wave frequency variations in the frequency-time slope of the bursts between 8 and 30 MHz are shown to be consistent with a model of 3-keV electrons accelerated in the ionosphere to the same energy, with longitudinal velocities at the point of cyclotron emission dependent on their initial pitch angle and the magnetic field, suggesting that electron acceleration is stable over long periods.

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