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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:Issued: 2024 Jun 18 0850 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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Another halo coronal mass ejection (CME) was observed by SOHO/LASCO-C2 at
approximately 20:20 UTC on June 17, with a projected speed of around 800
km/s. This event likely resulted from multiple CMEs erupting
simultaneously. The southwest-directed CME is probably associated with the
M1.4 flare, which began at 19:57 UTC and peaked at 20:35 UTC on June 17,
originating from NOAA active region 3711. The other component of the halo
CME is believed to be on the far side of the Sun.

Given NOAA active region 3711's position at longitude 56 on the west side,
the associated westward CME is not expected to have an Earth-directed
component.
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