Lightning

[76nemo]

I know we went through this before on the topic of lightning and we settled it was high frequency ACV. I was asked today about the magnitude of frequency and I didn't have an answer.

Any care to refresh me???????

 

[hurk27]

can be low as 500 Hz or as high as 100MHz, but more commonly found around 1 to 10 MHz.

 

[Hameedulla-Ekhlas]

I know we went through this before on the topic of lightning and we settled it was high frequency ACV. I was asked today about the magnitude of frequency and I didn't have an answer.

Any care to refresh me???????

The frequency of lightning occurrence has been extensively studeid and the results are published in the form of annual isokeraunic maps for different world regions. These are contour maps, which show the mean annual thunderstorm days of the region involved. A thundersgtorm day for this purpose is defined as one when thunder is heard at the point where it is measured. This obviously can not indicate whether it is a result of inter cloud or cloud to ground discharge. It does also show the frequency/number of instances or severity of cloud to ground strikes.

the isokeraunic map for Australia and NewZealand as well as Continnetal USA and Canada are shown as below