View of a colourful aurora borealis display (northern lights). Aurorae are caused by the interaction between energetic charged particles coming from the Sun and molecules of gases in the upper atmosphere (about 100km). A stream of charged particles, known as the solar wind, flows continuously from the Suns corona towards interplanetary space at speeds of 400500 kms. These particles do not reach the Earths atmosphere due to the shielding effect of the Earths magnetic field. However, violent solar activities such as solar flares emit highly energetic particles which penetrate this shield and ionise molecules in the atmosphere.
Work by Pekka Parviainen
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