*********************************************************************** Product: Daily Forecast of Geomagnetic Activity Issued: 2019 September 30 06:30UTC 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 29.09.2019 at 20:00 UTC was 67 sfu. The background X-Ray flux is at the class ‘7 level. The geomagnetic field was at quiet to active levels on September 29. 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: 465 km/s. Solar Wind speed from STEREO A: 320 km/s. Solar Wind speed from STEREO B: --- km/s. The southward component Bz is: 5 nT south. 3. Solar Energetic Particle Events Protons and electrons are quiet. 4. Coronal Holes An equatorial coronal hole (CH938) was in Earth facing position on September 24-25. A high speed stream of solar wind finally reached Earth on the first half of September 27 just a few hours earlier than it was predicted. 5. Geophysical Activity Forecast The geomagnetic field is expected to be at quiet to active levels on September 30, at quiet to unsettled levels on October 1 due to CH938 effects and at almost quiet levels on October 2. Date Estimated Ap index Expected geom. storm 2019.09.30 11 - 2019.10.01 08 - 2019.10.02 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 ***************************************************************************