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User ID: 78092574 United States 11/08/2020 12:41 PM Report Abusive Post Report Copyright Violation | C5-Class Solar Flare Causing Shortwave Radio Blackout The resulting pulse of radiation caused a 20-minute-long shortwave radio blackout over Australia and the Indian Ocean, reported by mariners, aviators, and ham radio operators at frequencies below 10 MHz. [ link to strangesounds.org (secure)] |