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

Apr 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978soph...57..445b&link_type=abstract

Solar Physics, vol. 57, Apr. 1978, p. 445-465. Research supported by the Consiglio Nazionale delle Ricerche.

Physics

13

Flow Stability, Magnetohydrodynamic Flow, Magnetohydrodynamic Waves, Solar Wind, Wave Propagation, Binary Fluids, Data Reduction, Interplanetary Magnetic Fields, Interplanetary Medium, Laminar Flow, Magnetoacoustic Waves, Magnetohydrodynamic Stability, Shear Flow, Solar Wind Velocity

Scientific paper

Several theoretical studies of velocity shear instabilities in high-beta plasmas are reviewed, and stability criteria are given for a number of cases. Plasma and magnetic-field data obtained simultaneously by Pioneer 6 within two high-velocity solar-wind streams are then analyzed to determine whether the Alfven waves observed in high-velocity streams are generated locally via velocity shear instabilities. Some general features of the waves associated with high-speed streams are discussed, and evidence for velocity shear instabilities in high-speed streams is examined. The analysis indicates that the data are apparently consistent with the occurrence of an Alfven-wave instability for waves propagating nearly parallel to the magnetic-field direction but that local velocity gradients are not sufficient to excite magnetoacoustic modes and Alfven waves propagating quasi-perpendicular to the magnetic field. It is concluded that velocity shear instabilities may be relevant to Alfven-wave generation in the short-wavelength part of the spectrum and that some of the short-wavelength Alfven waves might still be of solar origin.

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