[Elecraft] Lightning can effect the ionosphere

[kevinr at coho.net]

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