Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...392..637w&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 392, no. 2, June 20, 1992, p. 637-646.
Astronomy and Astrophysics
Astrophysics
4
Magnetic Field Reconnection, Magnetohydrodynamic Waves, Rankine-Hugoniot Relation, Shock Wave Propagation, Bernoulli Theorem, Kinetic Energy, Magnetohydrodynamic Flow, Two Dimensional Models
Scientific paper
A steady compressible MHD model is used to study 2D slow shock reconnection in low-beta plasmas. The model employs the exact Rankine-Hugoniot solutions to calculate the jump conditions at shock crossings. Solutions are found to exist in a small domain of the parametric space where the half-angle of the shock is a few degrees, the angle between the flow velocity and the magnetic field on the upstream side of the shock is of the order of 80 deg, and the beta-ratio on the upstream side of the shock (beta-1) is very small, of the order of 0.05. Across the shock the magnetic field changes by a factor of about 0.4, the plasma density increases by a factor of about 2.5, the thermal pressure increases by a factor of about 1/beta-1, and the magnetic field lines deflect sharply by an angle between 50 and 70 deg. A zeroth-order approximation of Bernoulli's equation is used to predict the expansion of the compressible MHD flow and the energy conversion process in the inflow region.
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