Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007a%26a...474.1031a&link_type=abstract
Astronomy and Astrophysics, Volume 474, Issue 3, November II 2007, pp.1031-1035
Astronomy and Astrophysics
Astrophysics
3
Planets And Satellites: Individual:, Jupiter, Radio Continuum: Solar System, Magnetohydrodynamics (Mhd), Waves, Plasmas, Instabilities
Scientific paper
The flux variability of Jovian decametric radio emission (DAM) is analyzed to search for its possible modulations by magnetohydrodynamic waves of ultra-low frequencies (ULF). The ULF modulating waves are found in DAM dynamic spectra as a moving pattern (moire) on the background of Jovian millisecond radio bursts (S-bursts). Their frequency drift ( 55 MHz/s) corresponds to the wave motion to Jupiter with Alfvén velocity ( 4 × 104 km s-1). There are whistler-like drifting details in the dynamic power spectra of ULF variations of S-burst emission flux at fixed radio frequency. Their frequency drift rates are consistent with whistlers that are dispersed mainly in the Io torus. Formally our analysis of DAM reveals the specific 2s-modulation of S-burst emission corresponding to the known magnetic pulsations near gyrofrequencies of heaviest ions (SO{2}+ and SO+) in the Io torus.
Arkhypov Oleksiy V.
Rucker Helmet O.
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