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The Hessdalen Automatic Measurement Station (or Hessdalen AMS) is an automatically working observation station in the Hessdalen area in the municipality of Holtålen in Trøndelag county, Norway. It is used for registering Hessdalen lights. It has been in service since 7 August 1998, and it is equipped with a magnetometer, two black and white TV cameras, and one colour TV camera.
As the equipment of the station is located in a blue container, it is also known as Blue Box.
The AMS regularly registers light phenomena. Since it only measures a restricted numbers of parameters, it is not able to explain all the recordings.
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