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The Digital All-Sky Imager (DASI2) is a fully automated fish-eye night-vision camera system capable of recording the aurora. It is located near Tromsø in northern Norway near the EISCAT radar site (69.6 N, 19.2 E).

go! Click here to view the latest DASI2 images

The 6-position filter wheel, populated with narrow band filters, allows the oxygen emission at 630 nm (red) above 200 km altitude, the oxygen emission at 557.7 nm (green) above 100 km altitude, and the nitrogen emission at 427.8 nm (blue-violet) above 95 km altitude to be recorded every 15 seconds.

Image from movie Colour movie (50 Mb MPEG file)

The video shows one night's worth of images as a pseudo-colour movie clip, sped up 150 times. Many auroral phenomena are seen, including arcs, omega bands, westward travelling surge, substorm onset, black auroras and pulsating auroras.

Small keogram imageExample three-wavelength keogram (250 k PNG file)

The angle versus time plots, called keograms, are produced by taking a north-south slice out of the images. They give an overview of the entire night's worth of auroral activity, separated by wavelength.

The data availability page shows what dates we have collected image data for so far.

Quick-look keograms for each night (uncalibrated, approx. 3 minute resolution) are available. (Note: the absence of data in the keograms does not necessarily mean that no data are available for that date/time)

The DASI2 System Log contains useful administrative information (restricted access).

The weather at Ramfjordmoen courtesy of Tromsø Geophysical Observatory.

The hut temperatures.

 M. J. Kosch

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