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arxiv: astro-ph/9808223 · v1 · submitted 1998-08-20 · 🌌 astro-ph

A Cosmic Battery

Ioannis Contopoulos (Dept. of Physics , Un. of Crete) , Demosthenes Kazanas (NASA/GSFC) This is my paper
classification 🌌 astro-ph
keywords fieldsobjectsaccountaccretingaccretionactiveadvection-dominatedalthough
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We show that the Poynting-Robertson drag effect in an optically thin advection-dominated accretion flow around active gravitating objects generates strong azimuthal electric currents which give rise to astrophysically significant magnetic fields. Although the mechanism is most effective in accreting compact objects, it seems very promising to also account for the generation of stellar dipolar fields during the late protostellar collapse phase, when the star approaches the main sequence.

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