*********************************************************************** Product: Daily Forecast of Geomagnetic Activity Issued: 2018 November 21 09:40UTC 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 20.11.2018 at 20:00 UTC was 71 sfu. The background X-Ray flux is at the class A4 level. The geomagnetic field was at very quiet to unsettled levels on November 20. 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: 400 km/s. Solar Wind speed from STEREO A: 360 km/s. Solar Wind speed from STEREO B: --- km/s. The southward component Bz is: 0 nT. 3. Solar Energetic Particle Events Protons and electrons are quiet. 4. Coronal Holes An extension of the south polar coronal hole (CH875) was in Earth facing position on November 16-17. 5. Geophysical Activity Forecast The geomagnetic field is expected to be at quiet levels, with a chance for unsettled intervals, on November 21 and at quiet levels on November 22-23. Date Estimated Ap index Expected geom. storm 2018.11.21 05 - 2018.11.22 04 - 2018.11.23 02 - *************************************************************************** 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 ***************************************************************************