*********************************************************************** Product: Daily Forecast of Geomagnetic Activity Issued: 2019 August 12 08:12UTC 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 11.08.2019 at 20:00 UTC was 68 sfu. The background X-Ray flux is at the class A7 level. The geomagnetic field was at quiet to unsettled 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: 370 km/s. Solar Wind speed from STEREO A: 320 km/s. Solar Wind speed from STEREO B: --- km/s. The southward component Bz is: 3 nT south. 3. Solar Energetic Particle Events Protons and electrons are quiet. 4. Coronal Holes A new coronal hole (CH933) on the southern hemisphere of the visible solar disk was in Earth facing position on August 7. 5. Geophysical Activity Forecast The geomagnetic field is expected to be at quiet levels with a chance for unsettled levels on August 12 due to CH933 weak effects and at quiet levels on August 13-14. Date Estimated Ap index Expected geom. storm 2019.08.12 03 - 2019.08.13 03 - 2019.08.14 02 - *************************************************************************** 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 ***************************************************************************