*********************************************************************** Product: Daily Forecast of Geomagnetic Activity Issued: 2019 October 23 06:24UTC 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 22.10.2019 at 20:00 UTC was 66 sfu. The background X-Ray flux is at the class A7 level. The geomagnetic field was at very quiet levels on October 22. No obviously Earth directed CMEs were observed in available LASCO imagery. The Kp index now is at very quiet levels with Kp=0. 2. Solar Wind Geomagnetic Activity Solar Wind speed from ACE: 370 km/s. Solar Wind speed from STEREO A: 450 km/s. Solar Wind speed from STEREO B: --- km/s. The southward component Bz is: 1 nT north. 3. Solar Energetic Particle Events Protons and electrons are quiet. 4. Coronal Holes A new equatorial coronal hole (CH941) was in Earth facing position on October 20-22. A high speed stream of solar wind from CH941 is expected to reach Earth on the second half of October 23. 5. Geophysical Activity Forecast The geomagnetic field is expected to be at quiet to active levels with a chance for minor storm intervals on October 23 and at unsettled to minor storm levels on October 24-25 due to CH941 effects. Date Estimated Ap index Expected geom. storm 2019.10.23 07 - 2019.10.24 23 G1 2019.10.25 22 G1 *************************************************************************** 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 ***************************************************************************