Lightning can effect the ionosphere

I just read about an ELVE above the Czech Republic.  ELVE - Emissions of
Light and Very Low Frequency Perturbations. http://spaceweather.com/ has
an article and an image.  The phenomenon creates a red doughnut shaped
ring lasting less than 0.001 seconds.  It does require a more forceful
lightning stroke than normal: 150-350 kiloAmps; approximately ten times
the normal strike.

With the recent talk of antenna protection from a local strike I thought
this reference was timely.

     Kevin.  KD5ONS

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