Northern Lights (Aurora)
We have a lot of Aurora here in Iceland it has now become a major tourist attraction during the dark months here in Iceland. Below is a definition of this lights from Wikipedia.
An aurora, sometimes referred to as a polar light, is a natural light display in the sky, predominantly seen in the high latitude (Arctic and Antarctic) regions.[nb 1] Auroras are produced when the magnetosphere is sufficiently disturbed by the solar wind that the trajectories of charged particles in both solar wind and magnetospheric plasma, mainly in the form of electrons and protons, precipitate them into the upper atmosphere (thermosphere/exosphere), where their energy is lost. The resulting ionization and excitation of atmospheric constituents emits light of varying colour and complexity. The form of the aurora, occurring within bands around both polar regions, is also dependent on the amount of acceleration imparted to the precipitating particles. Precipitating protons generally produce optical emissions as incident hydrogen atoms after gaining electrons from the atmosphere. Proton auroras are usually observed at lower latitudes. Different aspects of an aurora are elaborated in various sections below.
To shoot the Northern Lights you need good sturdy tripod (sometime it is windy in Iceland lighter tripods are often to light).
You need a good camera witch most of the camera are now days, even withe phones one can take images of the Northern Lights. Set the camera on manual, turn of the flash on the camera, you can not light up the Northern Lights, set the camera on at least 400-800 ISO (make test shoots) begin with about 5-8 second exposure time.
It is sometime hard to focus in the dark, there are few things that can help. First if the stars are bright use them to focus, if the moon is out that is a good focus point. I sometime use the light on my car or a flashlight I but in some distance to focus on. Be careful not to touch the lens after you have made the focus 100% .