*********************************************************************** Product: Daily Forecast of Geomagnetic Activity Issued: 2018 January 12 08:39UTC Prepared by the Athens Space Weather Forecasting Center *********************************************************************** 1. Solar activity Solar activity was almost stable during the past 24 hours. Solar Flux (10.7 cm) measured on 11.01.2018 at 20:00 UTC was 71 sfu. The background X-Ray flux is at the class A2 level. The geomagnetic field was at very quiet levels on January 11. 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: 340 km/s. Solar Wind speed from STEREO A: 470 km/s. Solar Wind speed from STEREO B: --- km/s. The southward component Bz is: 3 nT south. 3. Solar Energetic Particle Events Protons and electrons are quiet. 4. Coronal Holes A coronal hole (CH847) was in Earth facing position on January 8-9. A high speed stream of solar wind from this CH is expected to reach Earth on the last hours of January 12. 5. Geophysical Activity Forecast The geomagnetic field is expected to be at very quiet levels on January 12 and at quiet to unsettled levels, with a chance for active levels, on January 13-14. Date Estimated Ap index Expected geom. storm 2018.01.12 03 - 2018.01.13 12 - 2018.01.14 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 ***************************************************************************