*********************************************************************** Product: Daily Forecast of Geomagnetic Activity Issued: 2018 April 22 06:01UTC 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 21.04.2018 at 20:00 UTC was 77 sfu. The background X-Ray flux is at the class A8 level. The geomagnetic field was at quiet to unsettled levels on April 21. 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: 525 km/s. Solar Wind speed from STEREO A: 350 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 An equatorial coronal hole (CH861) was in Earth facing position on April 16-18. 5. Geophysical Activity Forecast The geomagnetic field is expected to be at quiet to unsettled levels on April 22 due to CH861 effects and at quiet levels on April 23-24. Date Estimated Ap index Expected geom. storm 2018.04.22 06 - 2018.04.23 04 - 2018.04.24 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 ***************************************************************************