*********************************************************************** Product: Daily Forecast of Geomagnetic Activity Issued: 2018 June 17 04:35UTC 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 16.06.2018 at 20:00 UTC was 71 sfu. The background X-Ray flux is at the class A3 level. The geomagnetic field was at very quiet levels on June 15. No obviously Earth directed CMEs were observed in available LASCO imagery. The Kp index now is at quiet levels with Kp=1. 2. Solar Wind Geomagnetic Activity Solar Wind speed from ACE: 320 km/s. Solar Wind speed from STEREO A: 330 km/s. Solar Wind speed from STEREO B: --- km/s. The southward component Bz is: 1 nT south. 3. Solar Energetic Particle Events Protons and electrons are quiet. 4. Coronal Holes A new coronal hole (CH869) in the northern hemisphere of the visible solar disk will be in Earth facing position on June 14-16. A high speed stream of solar wind is expected to reach Earth on the first half of June 18. 5. Geophysical Activity Forecast The geomagnetic field is expected to be at very quiet levels on June 17 and at quiet to unsettled levels on June 18-19 due to CH869. Date Estimated Ap index Expected geom. storm 2018.06.17 02 - 2018.06.18 06 - 2018.06.19 07 - *************************************************************************** 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 ***************************************************************************