Jorma Luhta / Aurora borealis colours in night sky showing corona, northern Finland, winter

Jorma Luhta / Aurora borealis bow prior to storm. Northern Finland, winter 2002

Jorma Luhta / Aurora borealis bow indicating approaching borealis storm. Northern Finland, winter 2002

Jorma Luhta / Aurora borealis storm colours in night sky, northern Finland, winter

Jorma Luhta / Aurora borealis storm colours in night sky, northern Finland, February 2002, winter

Jorma Luhta / Aurora borealis colours in night sky, northern Finland, winter

Jorma Luhta / Aurora borealis colours in night sky over lake, northern Finland

Jorma Luhta / Aurora borealis colours in night sky over lake, northern Finland (nr Arctic circle), October 2002. Auroras also occur in the southern hemisphere where they are know as Aurora australis.

Jorma Luhta / Aurora borealis colours in night sky over lake, northern Finland, October 2002

Jorma Luhta / Aurora borealis colours in night sky, northern Finland, winter

Jorma Luhta / Aurora borealis lights in night sky and full moon. Northern Finland, January, winter 2002

Jorma Luhta / Person watching Aurora borealis colours in night sky, northern Finland, winter