Jovian electron bursts - Correlation with the interplanetary field direction and hydromagnetic waves

Details Jovian electron bursts - Correlation with the interplanetary field direction and hydromagnetic waves Jovian electron bursts - Correlation with the interplanetary field direction and hydromagnetic waves

Jan 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976jgr....81...65s&link_type=abstract

Journal of Geophysical Research, vol. 81, Jan. 1, 1976, p. 65-72.

Physics

6

Electron Emission, Interplanetary Magnetic Fields, Jupiter (Planet), Magnetohydrodynamic Waves, Planetary Radiation, Electron Energy, High Energy Electrons, Magnetohydrodynamic Stability, Magnetospheric Electron Density, Pioneer 10 Space Probe, Plasma Waves

Scientific paper

The bursts of relativistic electrons detected on Pioneer 10 upstream from Jupiter and within 400 Jovian radii of the planet have been found to be correlated with the interplanetary magnetic field. In three examples, electrons with energies between 3 and 6 MeV escaping from Jupiter's magnetosphere were observed only when the interplanetary magnetic field was along the Jupiter-spacecraft line. Large-amplitude interplanetary waves with characteristic periods of 10 min were found to be well correlated with intervals during which the field was along the Jupiter-spacecraft line. Abrupt changes in the field away from the preferred direction caused equally abrupt terminations of the waves with an accompanying reduction in the electron flux. These results are consistent with propagation of the electrons from Jupiter to Pioneer along the magnetic field lines. Hydromagnetic wave generation by Jovian charged particles, presumably the relativistic electrons themselves, as they travel upstream, appears to be an attractive explanation for the origin of the waves. At the observed frequency, hydromagnetic waves are Doppler-shifted to the gyrofrequency of the relativistic electrons. A plasma instability that appears capable of explaining the observations is a cyclotron overstability that occurs when the velocity of runaway electrons exceeds the velocity of hydromagnetic waves.

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