*********************************************************************** Product: Daily Forecast of Geomagnetic Activity Issued: 2019 May 04 03:50UTC 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 03.05.2019 at 20:00 UTC was 70 sfu. The background X-Ray flux is at the class A9 level. The geomagnetic field was at quiet to unsettled levels on May 3. 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: 420 km/s. Solar Wind speed from STEREO A: 380 km/s. Solar Wind speed from STEREO B: --- km/s. The southward component Bz is: 5 nT north. 3. Solar Energetic Particle Events Protons and electrons are quiet. 4. Coronal Holes A new coronal hole (CH916) on the southern hemisphere of the visible solar disk was in Earth facing position on April 27-28. A high speed stream of solar wind finally reached Earth on the first half of May 1 as it was predicted. 5. Geophysical Activity Forecast The geomagnetic field is expected to be at almost quiet levels on May 4-6. Date Estimated Ap index Expected geom. storm 2019.05.04 04 - 2019.05.05 03 - 2019.05.06 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 ***************************************************************************