*********************************************************************** Product: Daily Forecast of Geomagnetic Activity Issued: 2018 February 17 05:21UTC 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 16.02.2018 at 20:00 UTC was 72 sfu. The background X-Ray flux is at the class A4 level. The geomagnetic field was at almost quiet levels on February 16. 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: 480 km/s. Solar Wind speed from STEREO A: 460 km/s. Solar Wind speed from STEREO B: --- km/s. The southward component Bz is: 6 nT north. 3. Solar Energetic Particle Events Protons and electrons are quiet. 4. Coronal Holes The coronal hole CH851 will be in Earth facing position on February 12-17. 5. Geophysical Activity Forecast The geomagnetic field is expected to be at quiet to active levels, with a chance for minor storm intervals, on February 17-19 due to the arrival of a high speed stream of solar wind from CH851. Date Estimated Ap index Expected geom. storm 2018.02.17 12 - 2018.02.18 11 - 2018.02.19 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 ***************************************************************************