Magnetic loading of magnetars' flares

Abstract

Magnetars, the likely sources of Fast Radio Bursts (FRBs), produce both steady highly relativistic magnetized winds, and occasional ejection events. We demonstrate that the requirement of conservation of the magnetic flux dominates the overall dynamics of magnetic explosions. This is missed in conventional hydrodynamic models of the ejections as expanding shell with parametrically added magnetic field, as well as one-dimensional models of magnetic disturbances. Most of the initial free energy of an explosion is actually spent on stretching its own internal magnetic field, while doing minimal $pdV$ work against the surrounding. Magnetic explosions from magnetars come into force balance with the pre-flares wind close to the light cylinder. They are then advected quietly with the wind, or propagate as electromagnetic disturbances. No powerful shock waves are generated in the wind.

References in corpus (10)

• Fast radio bursts as synchrotron maser emission from decelerating relativistic blast waves
• Corona of Magnetars
• INTEGRAL discovery of a burst with associated radio emission from the magnetar SGR 1935+2154
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• The synchrotron maser emission from relativistic magnetized shocks: Dependence on the pre-shock temperature
• Modelling Jets, Tori and Flares in Pulsar Wind Nebulae
• Fast Radio Bursts from reconnection events in magnetar magnetospheres
• Fields from a relativistic magnetic explosion
• Early GRB afterglows from reverse shocks in ultra-relativistic long-lasting winds
• Radio afterglow of magnetars' giant flares

Cited by in corpus (4)

• Magnetar bursts due to Alfvén wave nonlinear breakout
• Expanding Fireball in Magnetar Bursts and Fast Radio Bursts
• Relativistic magnetic explosions
• Faraday rotation in fast radio bursts