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 Jan 08 0857 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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The in situ observations (from DSCOVR satellite) indicate arrival of the
interplanetary shock wave at 05:55 UT this morning. The sudden increase of
the solar wind speed (from about 290 to 350 km/s) was observed
simultaneously with the increase of the density, temperature and the
interplanetary magnetic field magnitude (from about 6 nT to 15 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 induced disturbed geomagnetic conditions. The shock in the solar
wind is probably related with the expected arrival of the fast solar wind
associated with the low latitude extension of the northern polar coronal
hole which reached central meridian late evening of January 04.
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