*********************************************************************** Product: Daily Forecast of Geomagnetic Activity Issued: 2019 October 18 06:07UTC Prepared by the Athens Space Weather Forecasting Center *********************************************************************** 1. Solar activity Solar activity was almost stable during the past 24 hours. Solar Flux (10.7 cm) measured on 17.10.2019 at 20:00 UTC was 66 sfu. The background X-Ray flux is at the class A6 level. The geomagnetic field was at quiet levels on October 17. 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: 480 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 southern hemisphere coronal hole (CH940) was in Earth facing position on October 17-18. A high speed stream of solar wind is expected to reach Earth on the second half of October 20. A new equatorial coronal hole (CH941) will be in Earth facing position on October 20-21. 5. Geophysical Activity Forecast The geomagnetic field is expected to be at quiet levels on October 18-19 and at quiet to active levels on October 20. Date Estimated Ap index Expected geom. storm 2019.10.18 04 - 2019.10.19 03 - 2019.10.20 08 - *************************************************************************** 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 ***************************************************************************