*********************************************************************** Product: Daily Forecast of Geomagnetic Activity Issued: 2019 May 18 06:38UTC 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 17.05.2019 at 20:00 UTC was 72 sfu. The background X-Ray flux is at the class A8 level. The geomagnetic field was at quiet to unsettled levels on May 17. No obviously Earth directed CMEs were observed in available LASCO imagery of May 17. The Kp index now is at quiet levels with Kp=1. 2. Solar Wind Geomagnetic Activity Solar Wind speed from ACE: 420 km/s. Solar Wind speed from STEREO A: 330 km/s. Solar Wind speed from STEREO B: --- km/s. The southward component Bz is: 2 nT south. 3. Solar Energetic Particle Events Protons and electrons are quiet. 4. Coronal Holes An extension of the southern coronal hole (CH918) will be in Earth facing position on May 17-18. 5. Geophysical Activity Forecast The geomagnetic field is expected to be at very quiet levels on May 18-20. Date Estimated Ap index Expected geom. storm 2019.05.18 04 - 2019.05.19 03 - 2019.05.20 03 - *************************************************************************** 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 ***************************************************************************