*********************************************************************** Product: Daily Forecast of Geomagnetic Activity Issued: 2018 August 12 06:46UTC 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 11.08.2018 at 20:00 UTC was 67 sfu. The background X-Ray flux is at the class A2 level. The geomagnetic field was at almost quiet to active levels on August 11. No obviously Earth directed CMEs were observed in available LASCO imagery. The Kp index now is at quiet levels with Kp=1. 2. Solar Wind Geomagnetic Activity Solar Wind speed from ACE: 390 km/s. Solar Wind speed from STEREO A: 570 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 (CH879) was in Earth facing position on August 7-9. A new coronal hole (CH880) which is an extension of the northern polar coronal hole will be in Earth facing position on August 11-12. 5. Geophysical Activity Forecast The geomagnetic field is expected to be at quiet to unsettled levels, with a chance for active intervals, on August 12 and at quiet levels on August 13-14. Date Estimated Ap index Expected geom. storm 2018.08.12 08 - 2018.08.13 05 - 2018.08.14 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 ***************************************************************************