Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992itps...20..882g&link_type=abstract
IEEE Transactions on Plasma Science (ISSN 0093-3813), vol. 20, no. 6, p. 882-890.
Astronomy and Astrophysics
Astrophysics
Cosmic Plasma, Current Sheets, Energy Dissipation, Magnetohydrodynamic Flow, Tearing Modes (Plasmas), Interstellar Magnetic Fields, Magnetohydrodynamic Stability, Stagnation Point
Scientific paper
The paper examines the formation of compact magnetic structures by advection of an initial magnetic seed due to the motion of the plasma, and the intensification of the field due to line stretching. It is shown that when the plasma is squeezed locally by external agents, so that an inflow-outflow near a stagnation point is generated by the pinching, large amounts of Joule heating are obtained in a short time when the magnetic Reynolds number is large. For astrophysical plasmas, the significance of the mechanism under consideration is that fast dissipation of magnetic energy does not invoke anomalous resistivity, and neutral sublayers where change of sign of magnetic field occurs may vanish during the current sheet evolution, so that steady-state configurations prone to processes of reconnection or tearing instabilities do not develop.
Bender Laurence
Gnavi Graciela
Gratton Fausto T.
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