HELIOS observational constraints on the development of interplanetary slow shocks

Details HELIOS observational constraints on the development of interplanetary slow shocks HELIOS observational constraints on the development of interplanetary slow shocks

Jun 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988angeo...6..319r&link_type=abstract

Annales Geophysicae (ISSN 0980-8752), vol. 6, June 1988, p. 319-324.

Computer Science

Sound

10

Helios Project, Interplanetary Magnetic Fields, Magnetohydrodynamic Waves, Shock Wave Propagation, Solar Wind, Plasma Pressure, Solar Activity Effects, Temperature Distribution

Scientific paper

Helios plasma and magnetic field data between 0.3 and 1 AU have been used to compute the average radial dependence of the sound-to-Alfven speed ratio, of the ion-to-electron temperature ratio, and of the total plasma kinetic-to-magnetic pressure ratio. The analysis takes the stream structure of the solar wind and the parameters of protons, alpha particles, and electrons into account. Although the probability for the simultaneous fulfillment of the constraints for interplanetary slow mode MHD waves to freely evolve, to withstand ion Landau damping, and to steepen into slow shocks is extremely low, it is found to be highest in the slow wind near and at cororotating interaction regions.

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