Ground measurements of solar energetic particles are reportedly some of the largest since 2005. Photo: AP PHOTO

The largest solar storm to hit our planet for more than 20 years could disrupt communications and satellite navigation systems, the British Geological Survey has warned.

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The organisation has upgraded its geomagnetic forecast to the highest intensity level amid what has been dubbed a "cannibal storm".

Current predictions suggest a second storm, feeding off one from earlier in the week, could have further effects on space and ground-based technologies, the BGS said .

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