A cannibal CME occurs when two CMEs occur in relatively quick succession. If the second CME is traveling faster than the first, it will catch up and 'swallow' the slower one, becoming, in effect, one huge rolling wave of solar material heading through the Solar System.
The brunt of this impact is expected to be felt on 30 July, with aurora seen in the Northern Hemisphere as low as Pennsylvania to Iowa to Oregon, as well as Scotland, and the southernmost parts of mainland Australia in the Southern Hemisphere, as well as most of the South Island of New Zealand.
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