:Issued: 2025 Oct 19 0920 UTC :Product: documentation at http://www.sidc.be/products/presto #--------------------------------------------------------------------# # FAST WARNING 'PRESTO' MESSAGE from the SIDC (RWC-Belgium) # #--------------------------------------------------------------------# Geomagnetic conditions reached moderate storm levels globally (Kp 6), between 18:00 and 21:00 UTC on October 18, likely due to the ongoing influence of a glancing blow arrival of the CME of October 15. The solar wind speed was around 550 km/s. From 13:00 to 21:00 UTC on October 18, there was a prolonged interval of negative Bz with values of around -7nT (total magnetic field strength of around 13 nT) leading to the Kp 6. After this time, the Bz component reduced and became mostly positive after 03:00 UTC October 19 and the geomagnetic activity also reduced. Further periods of Kp 5 and Kp 6 are expected on October 19 due to the ongoing ICME impact and the influence of the high-speed stream from a negative polarity coronal hole (SIDC Coronal Hole 126). #--------------------------------------------------------------------# # 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 # # - Use and processing of your personal information: # # http://www.astro.oma.be/common/internet/en/privacy-policy-en.pdf # #--------------------------------------------------------------------#