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We present the first simulations of evolving, strongly twisted magnetarmagnetospheres. Slow shearing of the magnetar crust is seen to lead to a seriesof magnetospheric expansion and reconnection events, corresponding to X-rayflares and bursts. The axisymmetric simulations include rotation of the neutronstar and the magnetic wind through the light cylinder. We study how theincreasing twist affects the spindown rate of the star, finding that a dramaticincrease in spindown occurs. Particularly spectacular are explosive eventscaused by the sudden opening of large amounts of overtwisted magnetic flux,which may be associated with the observed giant flares. These events areaccompanied by a short period of ultra-strong spindown, resulting in an abruptincrease in spin period, such as was observed in the giant flare of SGR1900+14.

Twisting, reconnecting magnetospheres and magnetar spindown