*********************************************************************** Product: Daily Forecast of Geomagnetic Activity Issued: 2018 April 23 05:58UTC 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 22.04.2018 at 20:00 UTC was 71 sfu. The background X-Ray flux is at the class A5 level. The geomagnetic field was at very quiet levels on April 22. 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: 450 km/s. Solar Wind speed from STEREO A: 460 km/s. Solar Wind speed from STEREO B: --- km/s. The southward component Bz is: 4 nT north. 3. Solar Energetic Particle Events Protons and electrons are quiet. 4. Coronal Holes A new coronal hole (CH862) will be in Earth facing position on April 22-24. 5. Geophysical Activity Forecast The geomagnetic field is expected to be at quiet to unsettled levels on April 23 due to CH861 effects and at quiet levels on April 24-25. Date Estimated Ap index Expected geom. storm 2018.04.23 06 - 2018.04.24 03 - 2018.04.25 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 ***************************************************************************