On September 24, a strong storm of solar plasma struck Earth's magnetic field and set the night sky on 'fire'.

Across the northern hemisphere, from Europe to North America, those with clear skies were able to witness a spectacular red light show, described by at least one skywatcher as the 'Holy Grail of Northern Lights'.

Red auroras are rare enough as it is, but to see them as far south as France and Kansas with the naked eye is quite remarkable.

Centuries ago, some people in these lower latitudes thought the scarlet skies were a sinister sign of future war or tragedy.

Today, scientists know that auroras, both green and red, are a natural occurrence that cause no real harm to humans, although that doesn't make them any less awe-inspiring.

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