Measured in flashes/km²/year.
Original uploaded 7. Nov 2003 in Dansk wikipedia by da:Bruger:Glenn
Fra hollandsk Wikipedia (Bliksem). Kilde NASA: http://visibleearth.nasa.gov/cgi-bin/viewrecord?10812 . http://visibleearth.nasa.gov/help.html Citat: "...Unless otherwise noted, all images and animations made available through Visible Earth are generally not copyrighted...". Konverteret til JPEG.
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