CME Scoreboard

Prediction for CME (2017-06-28T16:24:00-CME-001)

:Issued: 2017 Jun 29 1002 UTC
:Product: documentation at http://www.sidc.be/products/presto
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# FAST WARNING 'PRESTO' MESSAGE  from the SIDC (RWC-Belgium)         #
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A long duration event took place near AR 2664 (position N20W30) between
12:30 and 21:00UT on 28 June. This was a very gradual event, with the x-ray
flux staying at the B1 level for nearly 5 hours (from about 13UT till 18UT,
no x-ray flare reported). SDO/AIA 193 imagery showed coronal dimming to the
north and south of AR 2664. CACtus has the associated coronal mass ejection
(CME) currently catalogued as 2 separate CMEs, both first seen in LASCO/C2
at 16:24UT. The bulk of this partial halo CME seems to be headed to the
southwest, and has an angular width of about 170 degrees. The CME is very
weak, and was not identified in the ST-A/COR2 imagery (though another
unrelated CME directed to the east can clearly be seen around 16UT). The
CME is also moving rather slow, with Plane-of-the-Sky speeds between 175
and 215 km/s, and estimated true speeds of around 275 km/s. A glancing blow
from this CME is expected around noon on 03 July +/-12 hours. At most
active geomagnetic conditions are expected.
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