Magnetic reconnection changes connectivity between magnetic field lines. It requires departure from smooth magnetic flux freezing, for example through finite resistivity or other nonideal terms concentrated in a current sheet. Ideal viscous magnetic relaxation dissipates mechanical energy while retaining frozen connectivity, so viscosity alone does not provide reconnection.
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Magnetic reconnection is a fundamental process in plasma physics that occurs when magnetic field lines from different magnetic domains converge, break, and reconnect in a new configuration. This phenomenon is particularly significant in astrophysical and space contexts, such as in the Sun's corona, Earth’s magnetosphere, and in fusion research. In more detail, magnetic reconnection can be described as follows: 1. **Configuration**: It typically involves two oppositely directed magnetic fields.