The coalescence of two merged interaction regions between 6.2 and 9.5 AU - September 1979 event

Details The coalescence of two merged interaction regions between 6.2 and 9.5 AU - September 1979 event The coalescence of two merged interaction regions between 6.2 and 9.5 AU - September 1979 event

Dec 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986jgr....9113341w&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 91, Dec. 1, 1986, p. 13341-13348.

Physics

22

Interplanetary Medium, Solar Wind, Computerized Simulation, Magnetohydrodynamic Flow, Pioneer 11 Space Probe, Solar Wind Velocity, Unsteady Flow, Voyager 1 Spacecraft

Scientific paper

A simulation study, based on an unsteady, one-dimensional, one-fluid MHD model, and using the plasma and magnetic field data from the Voyager 1 at 6.2 AU, was conducted on the evolution and interaction of solar wind structures to explain the two interaction regions observed by Voyager 1 within a large-scale interplanetary compound stream that was recorded at a heliocentric distance of 6.2 AU. A strong forward shock F(D) with a speed of 960 km/s was present at the front of the second interaction region, and two reverse shocks, R1 and R2, were at the end of the first interaction region. The model shows that the forward shock passed through the two reverse shocks and into the first interaction region, becoming weaker in each of these interactions. The reverse shocks coalesced to form a stronger reverse shock R; thus, the shock signature changed from R1-R2-F(D) to F(D)-R between 6.2 and 9.5 AU. The major stream structures at 9.5 AU predicted by the simulation model agree well with those directly observed from Pioneer 11.

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