*********************************************************************** Product: Daily Forecast of Geomagnetic Activity Issued: 2019 September 05 05:45UTC 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 04.09.2019 at 20:00 UTC was 69 sfu. The background X-Ray flux is at the class A6 level. The geomagnetic field was at almost quiet to unsettled levels on September 4. No obviously Earth directed CMEs were observed in available LASCO imagery. The Kp index now is at active levels with Kp=4. 2. Solar Wind Geomagnetic Activity Solar Wind speed from ACE: 540 km/s. Solar Wind speed from STEREO A: 300 km/s. Solar Wind speed from STEREO B: --- km/s. The southward component Bz is: 4 nT south. 3. Solar Energetic Particle Events Protons and electrons are quiet. 4. Coronal Holes A new coronal hole (CH936) on the southern hemisphere of the visible solar disk will be in Earth facing position on September 3-4. 5. Geophysical Activity Forecast The geomagnetic field is expected to be at almost quiet to active levels, with a chance for minor storm intervals, on September 5 and at almost quiet to unsettled levels on September 6-7 due to CH936 effects. Date Estimated Ap index Expected geom. storm 2019.09.05 20 - (G1) 2019.09.06 15 - 2019.09.07 10 - *************************************************************************** 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 ***************************************************************************