The tilts of corotating interaction regions at mid heliographic latitudes

Details The tilts of corotating interaction regions at mid heliographic latitudes The tilts of corotating interaction regions at mid heliographic latitudes

Jun 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995sowi.confr..94r&link_type=abstract

Arizona Univ., International Solar Wind 8 Conference, p. 94

Computer Science

Flow Deflection, Magnetohydrodynamics, Space Plasmas, Shock Waves, Solar Magnetic Field, Solar Position, Solar Rotation, Attitude (Inclination), Pressure Gradients, Simulation, Ulysses Mission, Wave Propagation

Scientific paper

Ulysses observations of corotating interaction regions (CIRs) at mid heliographic latitudes have shown that the flow downstream of the forward shock (or wave) on the leading edge of a CIR generally turns northward and westward, while the flow downstream of the reverse wave on the trailing edge generally turns southward and eastward. These systematic flow deflections are a natural consequence of large scale pressure gradients associated with the CIRs, and indicate that the forward waves tend to propagate toward and across the equator with increasing heliocentric distance, while the reverse waves tend to propagate toward the pole. Recent determinations of CIR shock normals using the Ulysses magnetic field data appear to confirm these plasma results (Burton, private communication). Numerical simulations indicate that these effects (which imply that CIRs are systematically tilted in the north-south direction at mid latitudes) are a natural consequence of the tilt of the solar magnetic dipole axis relative to the solar rotation axis. The present work utilizes a variety of techniques to analyze the flow deflections observed within CIRs from which we can infer the overall orientations of the CIRs and the speeds and directions of propagation of the waves. Where possible, the observations are quantitatively compared with the results of 3-dimensional MHD simulations.

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