A possible explanation lies in this: Ice crystals, especially long needles, tend to become aligned with the ambient electric field.
So what you are seeing is sunlight reflecting off ice crystal faces that are constantly being oriented by the developing electric field just above the (cumulonimbus) top. Then there is a discharge in the cloud, and the field collapses momentarily, and the crystals begin to realign again. Then this just keeps happening over and over.
Or it is this phenomenon due to (cloaked) UFO activities, you decide...
A similar video from 2009:
Source: streetcap1 fckwalm
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