This is an all-sky movie of the radio sky above the LOFAR prototype near Exloo in the Netherlands, taken on April 30th 2008. The image you see is at a frequency of 50 MHz and shows 24 hours of observations. North is up, East towards the left. You can se the bright radio sources Cassiopeia A and Cygnus A – in this video they twinkle like stars! The bright galactic centre can also be seen, rising and setting. I first saw this at.Astronomy in 2009. The reason I’m posting this is that I was thinking about how lightning must look in other wavelengths. I recalled that in this video you can see there are thunderstorms in radio wavelengths. At the end of the video they flash and flickr around the edges of the image. Very cool!

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