Effects of Magnetohydrodynamic Waves in Jovian Decametric Emission

Details Effects of Magnetohydrodynamic Waves in Jovian Decametric Emission Effects of Magnetohydrodynamic Waves in Jovian Decametric Emission

Aug 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007epsc.conf..640a&link_type=abstract

European Planetary Science Congress 2007, Proceedings of a conference held 20-24 August, 2007 in Potsdam, Germany. Online at ht

Physics

Scientific paper

The flux variability of Jovian decametric radio emission (DAM) is analysed to search for its possible modulations by propagating magnetohydrodynamic waves of ultra low frequencies (ULF). ULF modulating waves are found in DAM dynamic spectra as a moving pattern (moiré) on the background of S-bursts. Their frequency drift (~55 MHz/s) corresponds to the wave motion to Jupiter with Alfvén velocity (~4x104 km/s). There are whistler-like drifting details in the dynamic power spectra of S-flux variations at fixed radio frequency. Their frequency drift rates are consistent with dispersion of whistlers which are formed mainly in the Io torus or Jovian ionosphere. Formally our analysis of S-emission reveals the specific 2s-modulation of S-emission corresponding to the known magnetic pulsations near gyrofrequencies of heaviest ions (SO+2 and SO+) in the Io torus.

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