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Update: Expect moderate to high solar activity. A CME is expected to arrive at Earth today, 21 December. There is a possibility of aurora being observed in southern latitudes such as Tasmania at local night time hours on 21 and 22 December. An X-class flare occurred at 0027UT on 20 December and is expected to have a glancing blow at Earth on 22 December. The solar wind is presently light, but expected to increase to moderate after impact. Short-wave radio fadeouts likely. High-frequency radio communications normal at this time. http://www.ips.gov.au/