I have read that there are around a dozen of these recorded every year, and the scientists are keen to capture more. I have been meaning to grab some data myself, but the process of sifting through many hours of video for a 'flash' doesn't appeal!
Currently there is no software available to make the task remotely humane (not that I know of at least), so one can only assume that there must be many tens of events each year that could be seen if one was dedicated enough.
A nice example of some useful scientific data that is well within the reach of the amateur...
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