*********************************************************************** Product: Daily Forecast of Geomagnetic Activity Issued: 2018 March 18 08:22UTC 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 17.03.2018 at 20:00 UTC was 70 sfu. The background X-Ray flux is at the class A2 level. The geomagnetic field was at quiet to active levels on March 17. 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: 480 km/s. Solar Wind speed from STEREO A: 370 km/s. Solar Wind speed from STEREO B: --- km/s. The southward component Bz is: 2 nT south. 3. Solar Energetic Particle Events Protons and electrons are quiet. 4. Coronal Holes An equatorial coronal hole (CH857) was in Earth facing position on March 10-15. 5. Geophysical Activity Forecast The geomagnetic field is expected to be at quiet to active levels on March 18 due to CH857 effects and at quiet to unsettled levels on March 19-20. Date Estimated Ap index Expected geom. storm 2018.03.18 07 - 2018.03.19 05 - 2018.03.20 04 - *************************************************************************** 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 ***************************************************************************