*********************************************************************** Product: Daily Forecast of Geomagnetic Activity Issued: 2018 December 04 07:15UTC Prepared by the Athens Space Weather Forecasting Center *********************************************************************** 1. Solar activity Solar activity was decreasing stable during the past 24 hours. Solar Flux (10.7 cm) measured on 03.12.2018 at 20:00 UTC was 68 sfu. The background X-Ray flux is at the class A3 level. The geomagnetic field was at quiet to unsettled levels on December 3. No obviously Earth directed CMEs were observed in available LASCO imagery. The Kp index now is at unsettled levels with Kp=3. 2. Solar Wind Geomagnetic Activity Solar Wind speed from ACE: 425 km/s. Solar Wind speed from STEREO A: 420 km/s. Solar Wind speed from STEREO B: --- km/s. The southward component Bz is: 2 nT north. 3. Solar Energetic Particle Events Protons and electrons are quiet. 4. Coronal Holes An equatorial coronal hole (CH897) was in Earth facing position on November 26-29. A high speed stream of solar wind reached Earth on the first hours of December 1 as it was predicted with minor geomagnetic impact. A new equatorial coronal hole (CH898) will be in Earth facing position on December 4-5. 5. Geophysical Activity Forecast The geomagnetic field is expected to be at quiet to unsettled levels, with a chance for active intervals, on December 4-6. Date Estimated Ap index Expected geom. storm 2018.12.04 10 - 2018.12.05 12 - 2018.12.06 08 - *************************************************************************** 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 ***************************************************************************