Spontaneous reconnection at the boundaries of planetary magnetospheres

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Geomagnetism, Magnetic Field Reconnection, Planetary Magnetic Fields, Astronomical Models, Magnetic Dipoles, Magnetic Flux, Percolation, Solar Wind

Scientific paper

The theory of localized spontaneous reconnection at the boundaries of the magnetospheres of Solar system planets with strong intrinsic magnetic field is given. Localized sporadic reconnection patches are observed by satellites and other space probes in the form of so-called magnetic flux transfer events at Mercury, Earth, and Jupiter. The physical factors, controlling the temporal and spatial scales of this phenomenon in dependence on the distance from the Sun (the parameters of the solar wind) and the planetary magnetic dipole moment are discussed. The theoretical estimates, based on percolation model of spontaneous reconnection agrees satisfactorily with experimental data. The typical flux transfer parameters for Saturn and other astrophysical objects are evaluated.

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