*********************************************************************** Product: Daily Forecast of Geomagnetic Activity Issued: 2018 May 10 05:40UTC 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 09.05.2018 at 20:00 UTC was 70 sfu. The background X-Ray flux is at the class A3 level. The geomagnetic field was at almost quiet to active levels on May 9. 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: 560 km/s. Solar Wind speed from STEREO A: 410 km/s. Solar Wind speed from STEREO B: --- km/s. The southward component Bz is: 4 nT south. 3. Solar Energetic Particle Events Protons and electrons are quiet. 4. Coronal Holes An equatorial coronal hole (CH863) was in Earth facing position on May 2-6. 5. Geophysical Activity Forecast The geomagnetic field is expected to be at quiet to unsettled levels, with a chance for active intervals, on May 10 and at quiet to unsettled levels on May 11-12 due to CH863 effects. Date Estimated Ap index Expected geom. storm 2018.05.10 10 - 2018.05.11 08 - 2018.05.12 06 - *************************************************************************** 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 ***************************************************************************