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- W3098083895 abstract "We propose that the magnetosphere reconfiguration induced by magnetic twists in the closed field line region can account for the mode-switching of intermittent pulsars. We carefully investigate the properties of axisymmetric force-free pulsar magnetospheres with magnetic twists in closed field line region around the polar caps. The magnetosphere with twisted closed lines leads to enhanced spin-down rates. The enhancement in spin-down rate depends on the size of region with twisted closed lines. Typically, it is increased by a factor of $sim2$, which is consistent with the intermittent pulsars' spin down behavior during the `off' and `on' states. We find there is a threshold of maximal twist angle $Deltaphi_{rm thres}sim1$. The magnetosphere is stable only if the closed line twist angle is less than $Deltaphi_{rm thres}$. Beyond this value, the magnetosphere becomes unstable and gets untwisted. The spin-down rate would reduce to its off-state value. The quasi-periodicity in spin-down rate change can be explained by long-term activities in star's crust and the untwisting induced by MHD instability. The estimated duration time of on-state is about one week, consistent with observations. Due to the MHD instability, there exists an upper limit for the spin down ratio ($fsim3$) between the on-state and the off-state, if the Y-point remains at the light cylinder." @default.
- W3098083895 created "2020-11-23" @default.
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- W3098083895 date "2016-08-10" @default.
- W3098083895 modified "2023-09-26" @default.
- W3098083895 title "TWIST-INDUCED MAGNETOSPHERE RECONFIGURATION FOR INTERMITTENT PULSARS" @default.
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- W3098083895 doi "https://doi.org/10.3847/0004-637x/827/1/80" @default.
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