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Issued on 2021 May 15 1236 UTC
A partial halo, front-sided, Coronal Mass Ejection (CME) was observed by the SOHO/LASCO C2 and STEREO-A/COR2 coronographs at approximately 12:00 UT 13 March. The projected speed was measured to be 190 km/s, however this is a lower limit of the true speed. Based on a more realistic assumption for a speed of approximately 300 km/s, the Interplanetary Coronal Mass Ejection (ICME) is expected to arrive at Earth around the 18 May.
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