Hi Peter,

maybe it is caused by some sudden interaction between the thunder clouds and the
ionosphere? Rapid transport of electric charge through sprites and jets? Just a
wild guess...

73
Johan SM6LKM

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pws wrote:
> It's well known that lightnings may heat the ionosphere from
> below causing disturbances (SIDs). I very often observed
> those phenomena called "early/fast events". But what happened
> last Monday evening looks record-breaking. I never saw such
> chain of ionospheric disturbances.