PRESTO ALERT

Fast warning for important solar events with implications for the space environment.
Source SIDC (RWC-Belgium)
Frequency ASAP, when needed
Format Plain text
Mail header PRESTO ALERT
SIDC code presto

Archive

Latest issue

:Issued: 2017 Sep 17 2248 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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Newly arrived coronagraph data show two halo CME observed on September 17.

The first one, full halo CME was first seen in the SOHO/LASCO C2 field of
view at 12:24 UT (straight after the data gap). The CME had projected speed
of about 1600 km/s (as reported by CACTUS software).
Second, partial halo CME was first observed in the SOHO/LASCO C2 field of
view at 14:24 UT. 
The source region of both CMEs was Catania sunspot group 46 (NOAA AR 2673)
which is presently at the back side of the Sun, as seen from the Earth.
Since these CMEs are back side events, they will not arrive at the Earth.
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