Superposed epoch analysis of corotating interaction regions (CIR), at 0.3 and 1.0 AU: A comparative study

Details Superposed epoch analysis of corotating interaction regions (CIR), at 0.3 and 1.0 AU: A comparative study Superposed epoch analysis of corotating interaction regions (CIR), at 0.3 and 1.0 AU: A comparative study

Sep 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985stin...8624645r&link_type=abstract

Unknown

Computer Science

Interplanetary Medium, Plasma Diagnostics, Rotating Plasmas, Solar Activity Effects, Solar Wind, Wind Variations, Density Measurement, Helios 1, Helios 2, Magnetic Flux, Wind Velocity Measurement

Scientific paper

The superposed epoch analysis technique was applied to 16 and to 31 well defined, nonshock associated stream-stream interaction regions observed by HELIOS 1 and 2 between 0.3 and 0.4 AU and between 0.9 and 1.0 AU, respectively, to obtain the average azimuthal variations of the solar wind density, velocity and temperature of the magnetic field strength, and of the total proton plasma plus magnetic field pressure at these two radial distances. For the radial evolution of these interaction regions, comparison shows that due to compressional and rarefactional effects, the amplitudes of all parameters along the leading and trailing parts of the interaction steadily increase, with the most pronounced increase in pressure. The leading portion of the velocity profile steepens. Positions in azimuth of the overall maximum values of the solar wind density and temperature, of the magnetic field strength and of the plasma plus magnetic field pressure get lined-up in longitude. The leading portions of all profiles steepen into discontinuous, shock-like structures.

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