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

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Latest issue

:Issued: 2018 Feb 15 1051 UTC
:Product: documentation at http://www.sidc.be/products/presto
#--------------------------------------------------------------------#
# FAST WARNING 'PRESTO' MESSAGE  from the SIDC (RWC-Belgium)         #
#--------------------------------------------------------------------#
In-situ observations (from DSCOVR satellite) indicate the arrival of an
interplanetary shock wave at 07:55 UT this morning. The sudden increase of
the solar wind speed (from about 310 to 350 km/s) was observed
simultaneously with an increase in the density, temperature and the
interplanetary magnetic field magnitude (from about 2 nT to 7 nT). Since
the solar wind speed was, and is still rather low, and the Bz component of
the interplanetary magnetic field was mostly positive, the shock arrival
did not induce disturbed geomagnetic conditions. The shock is probably
related to the CME produced at 01:25 UT UT on 12-Feb-2018, which was
anticipated to arrive at approximately 12:00 UT today. A large coronal hole
that passed the central meridian a couple of days ago may also be the
cause, however the associated High Speed Stream (HSS) is expected to arrive
tomorrow.
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