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The Disconnection event happens when the charged particles from the solar wind change polarity, the like charges are repelled giving the effect of disconnection, so until the ions are reformed with the opposite polarity will the ion tail grow back again.This usually happens when the comet crosses a section of the Heliospheric Current Sheet which spirals out from the Sun.
There was a very good avi of 2P/ Encke losing its tail taken by a spacecraft last year or the year before.....
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