*********************************************************************** Product: Daily Forecast of Geomagnetic Activity Issued: 2018 April 11 06:05UTC Prepared by the Athens Space Weather Forecasting Center *********************************************************************** 1. Solar activity Solar activity was increasing during the past 24 hours. Solar Flux (10.7 cm) measured on 10.04.2018 at 20:00 UTC was 69 sfu. The background X-Ray flux is at the class A1 level. The geomagnetic field was at almost quiet to active levels on April 10. No obviously Earth directed CMEs were observed in available LASCO imagery. The Kp index now is at minor storm levels with Kp=5. 2. Solar Wind Geomagnetic Activity Solar Wind speed from ACE: 570 km/s. Solar Wind speed from STEREO A: 280 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 A new equtorial coronal hole (CH860) will be in Earth facing position on April 06-11. A high speed stream of solar wind reached Earth on the second half of April 09 as it was predicted. 5. Geophysical Activity Forecast The geomagnetic field is expected to be at almost quiet to minor storm intervals on April 11 and at quiet to active levels on April 12-13 due to CH860 effects. Date Estimated Ap index Expected geom. storm 2018.04.11 18 G1 2018.04.12 13 - 2018.04.13 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 ***************************************************************************