Solar alert

Issued on 2023 Dec 17 1233 UTC

At around 07:45 UTC on December 17, the magnetic field reached 16 nT (please, note the data gap in ACE and DSCOVR data that occurred between 05:54 UTC and 07:32 UTC on December 17). The solar wind speed increased from 445 to 550 km/s. The southward interplanetary magnetic component, Bz, reached a minimum of -11 nT. These disturbances most likely mark the arrival of the CMEs, that occurred on December 14-15. The ICME arrival has caused minor geomagnetic storms with NOAA Kp reaching 5- in the interval 09-12 UTC on December 17th, while locally over Belgium only unsettled conditions have been observed. Further minor to moderate geomagnetic storms periods may occur in the upcoming hours.

Reference for this alert

All Presto solar alerts