All sky camera is a general term used for a camera imaging the whole sky. The cameras used are fitted with a fish eye lens, equipped with a CMOS sensor. The fish eye lens sees the sky 360 degrees in azimuth and 180 degrees in elevation, hence all sky camera. Some of the all sky cameras are fitted with filters behind the lens for the three specific wavelengths discussed earlier, providing a clear picture of the aurora.
All sky cameras provide a direct image, this means no data analysis is required and shows a far more intuitive picture, in comparison to MSP and magnetometer data that needs to be interpreted. These images can be related to other optical and radio data. Another advantage to all sky cameras is that they can take videos, allowing real time observations and a high time resolution.
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