*********************************************************************** Product: Daily Forecast of Geomagnetic Activity Issued: 2018 May 16 05:30UTC 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 15.05.2018 at 20:00 UTC was 70 sfu. The background X-Ray flux is at the class A2 level. The geomagnetic field was at very quiet levels on May 15. No obviously Earth directed CMEs were observed in available LASCO imagery. The Kp index now is at very quiet levels with Kp=0. 2. Solar Wind Geomagnetic Activity Solar Wind speed from ACE: 330 km/s. Solar Wind speed from STEREO A: 380 km/s. Solar Wind speed from STEREO B: --- km/s. The southward component Bz is: 0 nT. 3. Solar Energetic Particle Events Protons and electrons are quiet. 4. Coronal Holes A new coronal hole (CH864) in the southern hemisphere of the visible solar disk will be in Earth facing position on May 13-15. A high speed stream of solar wind is expected to reach Earth on the second half of May 16. 5. Geophysical Activity Forecast The geomagnetic field is expected to be at quiet to unsettled levels on May 16 and at unsettled to minor storm levels on May 17-18 due to CH864. Date Estimated Ap index Expected geom. storm 2018.05.16 06 - 2018.05.17 17 G1 2018.05.18 16 G1 *************************************************************************** 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 ***************************************************************************