Let there be lights - Spectacular aurora light up the sky in the north

These amazing pictures of the northern lights were taken by astrophotographer Juan Carlos Casado in Greenland, Iceland and Finland.

He said: "Auroras are one of the most spectacular natural phenomena that can be seen.

"They are global spectacles, in the sense that they can cover the whole visible sky and combine with the terrestrial landscape as a wonderful symphony.

"My images try to capture these unique and unrepeatable moments: the shapes, colours and movements of auroras are never repeated.

"I have travelled several times to Iceland and south Greenland, where I have captured these images,

"I try to show the phenomenon but also try to convey the sensations they produce.

"For this I use several cameras simultaneously, so that they cover different areas of the landscape and the sky."

Aurora, are produced by the collision of charged particles from Earth's magnetosphere with atoms and molecules of Earth's atmosphere at altitudes above 80 km.

The particles originate from the Sun and reach the Earth in a stream of solar wind.

The solar wind is made up of many charged particles, elements, and isotopes that are present in the Sun.