:Issued: 2023 Jul 10 1308 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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A fast partial halo coronal mass ejection (CME) was first observed in the LASCO/C2
chronograph imagery at 04:00 UTC on July 10th. The CME has estimated projected
velocity around 1000 km/s and is related to M2.4-flaring from NOAA AR 3366 (beta)
with start time 03:29 UTC, peak time 03:55 UTC and end time 04:22 UTC on July 10th.
Type II radio emission was detected at 03:41 UTC during the flaring activity. While
the bulk of the ejecta is expected to miss Earth, preliminary analysis suggests that
a glancing blow could possibly arrive at Earth in the UTC afternoon of July 12th,
though probability of arrival is relatively small. Further analysis is ongoing to
better determine the CME direction of propagation and expected impacts at Earth.
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# Royal Observatory of Belgium                                       #
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:Issued: 2023 Jul 10 1704 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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A second westward partial halo coronal mass ejection (CME) was observed in the
LASCO/C2 chronograph imagery at 12:00 UTC on July 10th. The ejection has an estimated
velocity of 550 km/s and is related to a type II radio emission detected at 11:46
UTC. The CME is judged to be back-sided and is not expected to arrive to Earth.
#--------------------------------------------------------------------#
# Solar Influences Data analysis Center - RWC Belgium                #
# Royal Observatory of Belgium                                       #
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# Website         http://www.sidc.be.                                #
# E-mail          sidc-support@oma.be                                #
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#   http://www.astro.oma.be/common/internet/en/data-policy-en.pdf    #
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