:Issued: 2023 May 22 1303 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 full halo coronal mass ejection (CME) was first observed in LASCO/C2
chronograph imagery around 00:12 UTC on May 22nd. The CME has no on-disc signature
and was possibly driven by a back-sided flaring activity. No impact on Earth is
expected.
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# Solar Influences Data analysis Center - RWC Belgium                #
# Royal Observatory of Belgium                                       #
#                                                                    #
# Website         http://www.sidc.be.                                #
# E-mail          sidc-support@oma.be                                #
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:Issued: 2023 May 22 1323 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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Moderate geomagnetic storms were registered globally as measured by Kp NOAA in the
period 18:00 to 24:00 UTC on May 21st. Locally over Belgium mostly active conditions
were observed with a short isolated minor storm interval between 18:00 and 19:00 UTC
on May 21st. The observed geomagnetic storms are related to a weak ICME arrival
following a previously ongoing high speed stream. The interplanetary magnetic field
reached a maximum value of 13.22 nT and a minimum Bz of -10.57 nT, while the solar
wind velocity reached 657 km/s. Ionospheric disturbances and isolated post-storm
depressions have been observed following the geomagnetic storms. Unsettled to active
geomagnetic conditions are expected for the next 24 hours with further chances for
minor to moderate storms thereafter with the anticipated arrival of a new high speed
stream on May 23rd.
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# Solar Influences Data analysis Center - RWC Belgium                #
# Royal Observatory of Belgium                                       #
#                                                                    #
# Website         http://www.sidc.be.                                #
# E-mail          sidc-support@oma.be                                #
# To unsubscribe  http://www.sidc.be/registration/unsub.php          #
#                                                                    #
# Legal notices:                                                     #
# - Intellectual Property Rights:                                    #
#   http://www.astro.oma.be/common/internet/en/data-policy-en.pdf    #
# - Liability Disclaimer:                                            #
#   http://www.astro.oma.be/common/internet/en/disclaimer-en.pdf     #
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#   http://www.astro.oma.be/common/internet/en/privacy-policy-en.pdf #
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