*********************************************************************** Product: Daily Forecast of Geomagnetic Activity Issued: 2019 December 20 08:22UTC Prepared by the Athens Space Weather Forecasting Center *********************************************************************** 1. Solar activity Solar activity was increasing during the past 24 hours. Solar Flux (10.7 cm) measured on 19.12.2019 at 20:00 UTC was 70 sfu. The background X-Ray flux is at the class < A1 level. The geomagnetic field was at quiet to active levels on December 19. No obviously Earth directed CMEs were observed in available LASCO imagery. The Kp index now is at quiet levels with Kp=1. 2. Solar Wind Geomagnetic Activity Solar Wind speed from ACE: 455 km/s. Solar Wind speed from STEREO A: --- km/s. Solar Wind speed from STEREO B: --- km/s. The southward component Bz is: 0 nT. 3. Solar Energetic Particle Events Protons and electrons are quiet. 4. Coronal Holes A new small coronal hole (CH947) on the northern hemisphere of the visible solar disk will be in Earth facing position on Dec. 14-15. A high speed stream of solar wind from this CH reached Earth on the first hours of Dec. 18 as it was predicted. 5. Geophysical Activity Forecast The geomagnetic field is expected to be at almost quiet levels on December 20 and at very quiet levels on December 21-22. Date Estimated Ap index Expected geom. storm 2019.12.20 03 - 2019.12.21 02 - 2019.12.22 01 - *************************************************************************** Athens Space Weather Forecasting Center Physics Department, National & Kapodistrian University of Athens Athens Neutron Monitor Station A.NE.MO.S Tel.: +30 210 727 6901 email: spaceweather@phys.uoa.gr URL: http://spaceweather.phys.uoa.gr ***************************************************************************