Corona discharge of a vibrated insulating box with granular medium

  title={Corona discharge of a vibrated insulating box with granular medium},
  author={Laurent Schoenau and Tobias Steinpilz and Jens Teiser and Gerhard Wurm},
  journal={Granular Matter},
Corona discharges are luminous signs of strong local electric fields allowing a continuous discharge into the surrounding atmosphere. They commonly occur at the ends of conductors at high voltage. Here we report the observation of a faint glow surrounding an insulating cm-sized box filled with mm-sized basalt beads. At an ambient pressure in the mbar range two light bands occur as soon as and only if the box is vibrated and only if it is filled with a granular medium. In addition, a glow also… 

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