Low-frequency waves in the solar wind near Neptune

Details Low-frequency waves in the solar wind near Neptune Low-frequency waves in the solar wind near Neptune

Jun 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991georl..18.1071b&link_type=abstract

Geophysical Research Letters, Volume 18, Issue 6, p. 1071-1074

Physics

3

Interplanetary Physics: Mhd Waves And Turbulence, Interplanetary Physics: Solar Wind Plasma

Scientific paper

Plasma and magnetic field observations from the Voyager 2 spacecraft when it was outbound from Neptune reveal low-frequency waves in the solar wind which are clearly associated with the planet. The waves have frequencies below the proton cyclotron frequency fcp, which is about 10-3 Hz during the periods waves are observed. The waves are present when the interplanetary magnetic field is oriented such that the spacecraft is connected to the bow shock by the magnetic field lines. We have identified the waves to be Alfvénic waves propagating at ~140° to the ambient magnetic field and away from the bow shock. As at the other planets, these downstream waves are thought to be generated in the upstream region, where energetic protons created near the nose of the bow shock excite waves as they stream along solar wind magnetic field lines.

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