Local instabilities of Alfven waves in high speed streams

Details Local instabilities of Alfven waves in high speed streams Local instabilities of Alfven waves in high speed streams

Jan 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978stin...7928111b&link_type=abstract

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Computer Science

Magnetohydrodynamic Stability, Magnetohydrodynamic Waves, Solar Corpuscular Radiation, Wave Propagation, Interplanetary Magnetic Fields, Magnetoacoustic Waves, Pioneer 6 Space Probe, Solar Wind Velocity, Transverse Waves

Scientific paper

A two fluid stability analysis of an inhomogeneous solar wind plasma leads to a prediction of possible instabilities in both Alfven and magnetoacoustic waves driven by local velocity gradients. A detailed study, based on Pioneer 6 magnetic and plasma data relative to several high speed streams in the solar wind, on the direction of propagation of the transverse waves which are found within the streams, and on their association with velocity gradients within the stream structure was made. The analysis shows that the observed Alfven waves are consistent with the hypothesis of local generation through instabilities where velocity shear leads in fact to excitation of incompressible waves in directions almost parallel to the magnetic field.

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