*********************************************************************** Product: Daily Forecast of Geomagnetic Activity Issued: 2018 January 20 07:40UTC 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 19.01.2018 at 20:00 UTC was 71 sfu. The background X-Ray flux is at the class A3 level. The geomagnetic field was at quiet to unsettled levels on January 19. 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: 405 km/s. Solar Wind speed from STEREO A: 590 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 A new coronal hole (CH848) is expected to be in Earth facing position on January 16-19. A high speed stream of solar wind from this CH has arrived and caused minor effects up to now. 5. Geophysical Activity Forecast The geomagnetic field is expected to be at quiet to active levels with a chance for minor storm levels on January 20 and at quiet to unsettled levels on January 21-22 due to CH848 effects. Date Estimated Ap index Expected geom. storm 2018.01.20 13 - 2018.01.21 10 - 2018.01.22 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 ***************************************************************************