*********************************************************************** Product: Daily Forecast of Geomagnetic Activity Issued: 2019 May 21 06:08UTC 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 20.05.2019 at 20:00 UTC was 69 sfu. The background X-Ray flux is at the class A8 level. The geomagnetic field was at quiet to unsettled levels on May 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: 430 km/s. Solar Wind speed from STEREO A: 540 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 An extension of the southern coronal hole (CH918) was in Earth facing position on May 17-18. 5. Geophysical Activity Forecast The geomagnetic field is expected to be at quiet to unsettled levels on May 21-22 due to weak effects from CH918 and at quiet levels on May 23. Date Estimated Ap index Expected geom. storm 2019.05.21 06 - 2019.05.22 07 - 2019.05.23 04 - *************************************************************************** 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 ***************************************************************************