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Advent calendar 2020: 11. Aurora borealis in the north of Sweden

Advent calendar 2020: 11. Aurora in northern Sweden

Sweden is a northern country. It has significant territory inside the Arctic Circle, and aurora can often be seen in winter. Aurora is caused by the interaction between Earth’s magnetic field, atmosphere, and solar wind. Aurora borealis is the aurora of the north; it usually appears at latitudes of around 70-80 degrees north, although occasional…...