💾 Archived View for radia.bortzmeyer.org › presto › 2024-09-17.gmi captured on 2024-09-29 at 04:07:01. Gemini links have been rewritten to link to archived content
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Issued on 2024 Sep 17 0733 UTC
A fast-forward shock was registered in situ in the solar wind data at 22:49 UTC on Sept 16th, marking the expected arrival of the halo coronal mass ejection (CME), which lifted off the solar surface on Sept 14th. The interplanetary magnetic field jumped from 9 nT to 16 nT and the solar wind velocity initially increased from 455 to 498 km/s/. In the hours following the shock arrival the interplanetary magnetic field reached up to 19.9 nT with Bz of -18 nT and solar wind velocities approaching 600 km/s. The ICME arrival caused globally strong to severe geomagnetic storms with NOAA Kp reaching 8- and Kp Potsdam registering 7+. The local geomagnetic conditions over Belgium were milder, reaching only minor storm levels from 01:00 UTC onwards. The solar wind and geomagnetic conditions are expected to remain perturbed under the ongoing influence of the ICME and a possible high speed stream arrival on Sept 18th with probable further minor to moderate geomagnetic storm levels.
Issued on 2024 Sep 17 0819 UTC
The greater than 10 MeV proton flux as measured by GOES 16 and GOES 18 has now exceeded the 10 pfu threshold marking a minor solar radiation storm. The proton flux levels were increased as a result of the solar activity on Sept 14th with X4.5 flaring from NOAA 3825 (beta-gamma) and associated halo coronal mass ejection (CME), which has now arrived to Earth. The greater than 10 MeV proton flux levels are expected to remain elevated on Sept 17th and start declining on Sept 18th in case of no new strong eruptive solar activity.