Lapland, Finland

An aurora is a natural light display in the sky, particularly in the polar teritories, caused by the collision of charged particles directed by the Earth's magnetic field. An aurora is usually observed at night and typically occurs in the ionosphere. It is also referred to as a polar aurora or, collectively, as polar lights (Polish: zorza polarna). This card shows the auroras in Lapland, Finland.
Based on Wikipedia: 12.01.2011.

An official PC card from Ulla-Maija.