*********************************************************************** Product: Daily Forecast of Geomagnetic Activity Issued: 2018 June 23 04:33UTC 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 22.06.2018 at 20:00 UTC was 80 sfu. The background X-Ray flux is at the class A9 level. The geomagnetic field was at very quiet levels on June 22. No obviously Earth directed CMEs were observed in available LASCO imagery. The Kp index now is at almost quiet levels with Kp=2. 2. Solar Wind Geomagnetic Activity Solar Wind speed from ACE: 360 km/s. Solar Wind speed from STEREO A: 640 km/s. Solar Wind speed from STEREO B: --- km/s. The southward component Bz is: 1 nT north. 3. Solar Energetic Particle Events Protons and electrons are quiet. 4. Coronal Holes A new coronal hole (CH870) in the northern hemisphere of the visible solar disk will be in Earth facing position on June 19-21. A high speed stream of solar wind is expected to reach Earth on the first half of June 23. 5. Geophysical Activity Forecast The geomagnetic field is expected to be at quiet to active levels on June 23-25 due to CH870 effects. Date Estimated Ap index Expected geom. storm 2018.06.23 07 - 2018.06.24 10 - 2018.06.25 11 - *************************************************************************** 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 ***************************************************************************