*********************************************************************** Product: Daily Forecast of Geomagnetic Activity Issued: 2019 August 20 06:13UTC 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 19.08.2019 at 20:00 UTC was 68 sfu. The background X-Ray flux is at the class A6 level. The geomagnetic field was at very quiet levels on August 19. 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: 360 km/s. Solar Wind speed from STEREO A: 300 km/s. Solar Wind speed from STEREO B: --- km/s. The southward component Bz is: 3 nT north. 3. Solar Energetic Particle Events Protons and electrons are quiet. 4. Coronal Holes A poorly defined coronal hole (CH) on the southern hemispere of the visible solar disk was in Earth facing position on August 16-17. 5. Geophysical Activity Forecast The geomagnetic field is expected to be at almost quiet levels with a chance for unsettled intervals on August 20-22 due to weak effects from the poorly defined CH. Date Estimated Ap index Expected geom. storm 2019.08.20 06 - 2019.08.21 06 - 2019.08.22 05 - *************************************************************************** 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 ***************************************************************************