*********************************************************************** Product: Daily Forecast of Geomagnetic Activity Issued: 2024 December 21 08:11UTC Prepared by the Athens Space Weather Forecasting Center ***********************************************************************
I. Solar activity --Current Status Solar Flux (10.7cm) measured on 20.12.2024 at 23:00 UTC was 175 sfu. The background X-Ray flux is at the class C2.7 level. No obviously Earth directed CMEs were observed in available LASCO imagery on December 18. A coronal hole (CH1263) at southern hemisphere rotated across the central meridian on December 19-20.
II. Solar Energetic Particle Events Protons and electrons fluxes are quiet.
III. Interplanetary and Geomagnetic conditions The solar wind speed measured by ACE satellite reached the max value 541 Km/s on December 20 at 12:05 UT during the last 24 hours. The solar wind speed from STEREO A was detected 400 Km/s during the last 24 hours. The vertical component of IMF Bz reached the max value -8 nT on December 20 at 15:15 UT during the last 24 hours. The geomagnetic field was at quiet to unsettled levels during the last 24 hours. The Kp index now is at unsettled levels with Kp=3.
IV. 3-day Geomagnetic Activity Forecast The geomagnetic field is expected to be at quiet to unsettled levels on December 21-23.
Date
Ap index forecast
Geomagnetic Activity level
21.12.2024
08
Quiet to Unsettled
22.12.2024
08
Quiet to Unsettled
23.12.2024
10
Quiet to Unsettled
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