Glitch (astronomy) 4566277 191665661 2008-02-15T16:19:06Z Ioeth 1719239 Reverted to revision 190969482 by [[Special:Contributions/Ioeth|Ioeth]]; rv self edit test. (using [[WP:TWINKLE|Twinkle]]) A '''glitch''' is a sudden increase (up to 1 part in 10<sup>6</sup>) in the rotational [[frequency]] of a [[rotation-powered pulsar]], which usually decreases steadily due to braking provided by the emission of radiation and high-energy particles. It is unknown whether or not they are related to the [[timing noise]] which all pulsars exhibit. Following a glitch is a period of gradual recovery where the observed [[periodicity]] slows to a period close to that observed before the glitch. These gradual recovery periods have been observed to last from days to years. Currently, only multiple glitches of the [[Crab Pulsar|Crab]] and [[Vela Pulsar|Vela]] pulsars have been observed and studied extensively == Cause == While the exact cause of glitches is unknown, they are thought to be caused by an internal process within the pulsar. This differs from the steady decrease in the star's rotational frequency which is caused by external processes. Although the details of the glitch process are unknown, it is thought that the resulting increase in the pulsar's rotational frequency is caused by a brief coupling of the the pulsar's faster-spinning [[superfluid]] core to the crust, which are usually decoupled. This brief coupling transfers angular momentum from core to the surface, which causes an increase in the measured periodicity. It is thought that the coupling could be caused by a breaking of the pulsar's magnetic dipole, which would apply a torque to the crust causing a brief coupling between the two parts. == References == * http://www.nature.com/nature/journal/v359/n6396/abs/359616a0.html * http://www.saao.ac.za/~wgssa/as4/urama.html * http://www.sciencemag.org/cgi/content/summary/289/5476/13c {{var-star-stub}} {{physics-stub}} [[ru:Глитч (астрономия)]] [[Category:Rotation-powered pulsars]]