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: 2021 Oct 16 0803 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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DSCOVR registered a fast forward shock in the solar wind at 00:12 UT on
October 16. The solar wind speed jumped from about 300 to 345 km/s, while
the magnitude of the Interplanetary Field (IMF) jumped from about 6 to 8 nT
and the density jumped from about 4.5 to 6.5 counts/cc. The IMF orientation
stayed predominantly towards the Sun. This probably corresponds to the
Corotating Interaction Region (CIR) in front of the high speed stream from
a negative polarity equatorial coronal hole. Enhanced solar wind conditions
are possible in the next 24 hours.

Geomagnetic indexes K Dourbes and NOAA Kp have stayed quiet to unsettled
since the arrival of the CIR. Active geomagnetic intervals (K Dourbes = 4)
are possible in the next 24 hours, with a slight chance for minor storm
intervals (K Dourbes = 5).
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