Global, quasi-steady dynamics of the distant solar wind. 1: Origin of north-south flows in the outer heliosphere

Details Global, quasi-steady dynamics of the distant solar wind. 1: Origin of north-south flows in the outer heliosphere Global, quasi-steady dynamics of the distant solar wind. 1: Origin of north-south flows in the outer heliosphere

Mar 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994jgr....99.4173p&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 99, no. A3, p. 4173-4183

Physics

61

Current Sheets, Heliosphere, Interplanetary Magnetic Fields, Interplanetary Medium, Magnetic Equator, Magnetohydrodynamic Flow, Solar Wind, Computerized Simulation, Solar Activity, Voyager 2 Spacecraft

Scientific paper

Regular, large amplitude north-south flow deflections were observed near the heliographic equator by Voyager 2 in the outer heliosphere in 1986. We present results of numerical simulations supporting the idea that these motions are driven by interplanetary dynamical interactions occurring at quasi-steady stream fronts associated with the tilted-dipole coronal magnetic configuration at solar minimum. It is shown that under these conditions the coronal geometry is deeply impressed upon the large scale flow and it determines the disposition and orientation of solar wind structures to great heliocentric distances. The observed predominance of the north-south flow deflections (relative to the east-west deflections) and their observed quasiperiodicity are seen to be a natural consequence of the two-sector tilted-dipole stream structure in which the fronts of successive corotating interaction regions have opposing north-south tilts.

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