It's due ice crystals colliding and making for enough static electricity to generate lightning strikes, that's due the ashes and vapor rising that ice is formed
Volcanic lightning is an electrical discharge caused by a volcanic eruption rather than from an ordinary thunderstorm. Volcanic lightning arises from colliding, fragmenting particles of volcanic ash (and sometimes ice), which generate static electricitywithin the volcanic plume, leading to the name Moist convection and ice formation also drive the eruption plume dynamics and can trigger volcanic lightning.Unlike ordinary thunderstorms, volcanic lightning can also occur before any ice crystals have formed in the ash cloud.
Volcanic lightning is an electrical discharge caused by a volcanic eruption rather than from an ordinary thunderstorm. Volcanic lightning arises from colliding, fragmenting particles of volcanic ash (and sometimes ice), which generate static electricitywithin the volcanic plume, leading to the name Moist convection and ice formation also drive the eruption plume dynamics and can trigger volcanic lightning.Unlike ordinary thunderstorms, volcanic lightning can also occur before any ice crystals have formed in the ash cloud.
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