Wave phenomena in the upstream region of Saturn

Details Wave phenomena in the upstream region of Saturn Wave phenomena in the upstream region of Saturn

Dec 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992jgr....9719187o&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 97, no. A12, p. 19,187-19,199.

Physics

17

Interplanetary Magnetic Fields, Magnetohydrodynamic Flow, Saturn Atmosphere, Shock Fronts, Wave Packets, Polarization Characteristics, Voyager 1 Spacecraft, Voyager 2 Spacecraft, Wave Propagation

Scientific paper

A search was carried out for the signatures of waves associated with both the electron and the ion foreshocks in the upstream region of Saturn, using magnetic-field data obtained by Voyager 1 and 2 during transit through this region. Two distinct bands of wave activity were found at frequencies around 0.5-mHz and 2-mHz in the upstream region. The two classes of waves differ considerably in their properties: the 0.5-mHz waves are righthanded and strongly elliptically polarized, while the 2-mHz waves are elliptically or circularly polarized in the left-handed sense. It is suggested that the two waves may be associated with two different backstreaming particle distributions, possibly those reflected from the shock and those leaking from the hot magnetic field at frequencies between 90 and 150 mHz.

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