Abstract
Cosmic plasma phenomena are often characterized by the interaction of hot and cold plasma components. Magnetic fields prove to be of particular importance in the dynamics of such plasmas. As an example, three different cosmic objects are studied by means of two- and three-dimensional plasma-neutral gas fluid simulations. It is shown that magnetic fields can be responsible for the dynamical stabilization of neutral gas clouds in the Galactic halo. Disconnection events in cometary tails can be caused by magnetic reconnection. The interaction of the solar wind with the Earth during periods of a vanishing dipole field can lead to the generation of a magnetic field in the ionosphere thereby protecting the biosphere against cosmic rays.
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