31 October 2013

Global lightning strikes. And lodestones.

An interesting distribution, with some curiously sharp demarcations.

And this interesting tidbit, from the source Wikipedia page:
The intense currents of a lightning discharge create a fleeting but very strong magnetic field. Where the lightning current path passes through rock, soil, or metal these materials can become permanently magnetized. This effect is known as lightning-induced remanent magnetism, or LIRM. These currents follow the least resistive path, often horizontally near the surface but sometimes vertically, where faults, ore bodies, or ground water offers a less resistive path. One theory suggests that lodestones, natural magnets encountered in ancient times, were created in this manner.


  1. Surprising about Australia. I'd always heard it was the most lightning-prone place on the planet.

  2. "Remanent"? Do they mean remnant?

    1. Here, let me Wiki that for you...



Related Posts Plugin for WordPress, Blogger...