The Interaction of a Strong Magnetic Field with a Cold Plasma: The Evolution of a Magnetic Bubble

Astronomy and Astrophysics – Astronomy

Scientific paper

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Ism: Magnetic Fields, Magnetohydrodynamics: Mhd, Sun: Solar Wind, Stars: Formation, Stars: Supernovae: General

Scientific paper

An intense localized magnetic field is suddenly introduced into a stationary, uniform, cold plasma and generates a region characterized by an intense field that excludes all particles (``magnetic bubble'') enveloped by a spherical shell of very dense plasma (``snowplow''). Outside the shell, the field disappears over a small distance scale and the plasma density tends to that of the undisturbed plasma. While a mathematically self-similar solution to the astrophysical problem associated with the early history of the magnetic bubble exists, the dynamical evolution maintains a subtle but significant difference from the self-similar solution. This MHD behavior can arise in the evolution of young stellar objects, during the switch-on of an OB star, in the solar wind, and during the formation of a magnetized neutron star or ``magnetar'' immediately following a supernova explosion.

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