- When we had first collected all the measurements - of UV light, of electrons, of plasma density and of gas density - and discovered the image that came up, we just looked at each other and said: "but, this is the northern lights!", Says Anders Eriksson at the Institute of Space Physics in Uppsala to the radio.

According to Eriksson, who is one of the researchers behind the study, it is not possible to see the light phenomenon on comet 67P without advanced measurements as the light is drenched by sunlight.

The measurements were made by the European Space Agency's ESA spacecraft Rosetta, which completed its mission in 2016.

- Now we are sitting on a huge pile of data that we are still analyzing.

We will continue to do so for a long time to come, says Eriksson.

See previous photos of the northern lights over Uppsala:

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The northern lights in Skutskär were visible between 9 pm and 10 pm.

Photo: Patric Norlin