Diffusive spreading of dynamo fields into turbulent exteriors reverses the usual decay ordering, allowing quadrupole toroidal components to decay slower than dipoles and confining fields within a magnetosphere whose synchrotron signatures are potentially observable.
On the contribution of galaxies to the magnetic field in cosmic voids
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abstract
Astrophysical processes can contribute to magnetic fields within cosmic voids either through magnetized outflows from the astrophysical large-scale structure or through superposition of dipolar contributions from individual galaxies. Such astrophysical magnetic fields represent a foreground to possible space-filling primordial magnetic fields seeded in the early Universe. In this paper, we provide a qualitative description of the screening of magnetic fields by intergalactic plasmas. We find that contributions from superposition of static dipoles are highly suppressed and cannot explain indications for lower bounds based on observations of $\gamma$-ray cascades from high energy sources such as blazars.
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Magnetic field spreading from stellar and galactic dynamos into the exterior
Diffusive spreading of dynamo fields into turbulent exteriors reverses the usual decay ordering, allowing quadrupole toroidal components to decay slower than dipoles and confining fields within a magnetosphere whose synchrotron signatures are potentially observable.