*********************************************************************** Product: Daily Forecast of Geomagnetic Activity Issued: 2019 August 27 05:17UTC 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 26.08.2019 at 20:00 UTC was 67 sfu. The background X-Ray flux is at the class A6 level. The geomagnetic field was at quiet levels on August 26. 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: 470 km/s. Solar Wind speed from STEREO A: 650 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 (CH934) on the southern hemisphere of the visible solar disk was in Earth facing position on August 23-24. A high speed stream of solar wind from this CH is expected to reach Earth on the second half of Aug. 27. A new coronal hole (CH935) on the northern hemisphere of the visible solar disk is expected to be in Earth facing position on August 27-28. 5. Geophysical Activity Forecast The geomagnetic field is expected to be at quiet to active levels with a chance for minor storm intervals on August 27-28 and at quiet to unsettled levels on August 29 due to CH934 effects. Date Estimated Ap index Expected geom. storm 2019.08.27 14 - 2019.08.28 12 - 2019.08.29 07 - *************************************************************************** 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 ***************************************************************************