Physics
Scientific paper
Apr 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978jgr....83.1576s&link_type=abstract
Journal of Geophysical Research, vol. 83, Apr. 1, 1978, p. 1576-1582.
Physics
5
Computerized Simulation, Interplanetary Magnetic Fields, Magnetohydrodynamic Waves, Shock Wave Propagation, Solar Wind, Space Environment Simulation, Pioneer 10 Space Probe, Pioneer 9 Space Probe, Propagation Velocity, Velocity Distribution
Scientific paper
The effects of the interplanetary magnetic field on the propagation speed of shock waves through an ambient solar wind are examined by numerical solutions of the time-dependent nonlinear equations of motion. The magnetic field always increases the velocity of strong shocks. Although the field may temporarily slow down weak shocks inside 1 AU, it eventually also causes weak shocks to travel faster than they would without the magnetic field at larger distances. Consistent with the increase in the shock velocity, the gas pressure ratio across a shock is reduced considerably in the presence of the magnetic field. The numerical method is used to simulate (starting at 0.3 AU) the large deceleration of a shock observed in the lower corona by ground-based radio instrumentation and the more gradual deceleration of the shock in the solar wind observed by the Pioneer 9 and Pioneer 10 spacecraft.
Dryer Murray
Steinolfson Richard S.
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