Pioneer 10 and 11 observations of waves upstream of interplanetary corotating shocks

Details Pioneer 10 and 11 observations of waves upstream of interplanetary corotating shocks Pioneer 10 and 11 observations of waves upstream of interplanetary corotating shocks

Jan 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987jgr....92..285b&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 92, Jan. 1, 1987, p. 285-290.

Physics

6

Corotation, Interplanetary Space, Magnetic Field Configurations, Plasma Waves, Satellite Observation, Shock Wave Propagation, Collisionless Plasmas, Magnetohydrodynamic Stability, Pioneer 10 Space Probe, Pioneer 11 Space Probe

Scientific paper

An extended region of enhanced magnetic field fluctuations is found upstream of some of the corotating shocks observed by Pioneer 10 and Pioneer 11 between 1 and 5 AU. This perturbed region is present when the corotating shock, generally quasi-perpendicular, becomes oblique or quasi-parallel due to a temporary out-of-spiral direction of the upstream magnetic field. The observed waves are almost not compressional. Their amplitude is a large fraction of the ambient field, and their frequency is around 1 mHz in the spacecraft frame. A brief discussion of the possible mechanisms of generation is given.

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