*********************************************************************** Product: Daily Forecast of Geomagnetic Activity Issued: 2019 December 16 06:43UTC 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 15.12.2019 at 20:00 UTC was 71 sfu. The background X-Ray flux is at the class < A1 level. The geomagnetic field was at quiet levels on December 15. No obviously Earth directed CMEs were observed in available LASCO imagery. The Kp index now is at very quiet levels with Kp=0. 2. Solar Wind Geomagnetic Activity Solar Wind speed from ACE: 375 km/s. Solar Wind speed from STEREO A: --- km/s. Solar Wind speed from STEREO B: --- km/s. The southward component Bz is: 1 nT north. 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. An associated with this CH high speed stream of solar wind is expected to reach Earth on the first half of December 18. 5. Geophysical Activity Forecast The geomagnetic field is expected to be at very quiet levels on December 16-17 and at quiet to active levels on December 18 due to CH947 effects. Date Estimated Ap index Expected geom. storm 2019.12.16 01 - 2019.12.17 02 - 2019.12.18 10 - *************************************************************************** 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 ***************************************************************************