*********************************************************************** Product: Daily Forecast of Geomagnetic Activity Issued: 2019 July 31 04:05UTC Prepared by the Athens Space Weather Forecasting Center *********************************************************************** 1. Solar activity Solar activity was decreasing during the past 24 hours. Solar Flux (10.7 cm) measured on 30.07.2019 at 20:00 UTC was 67 sfu. The background X-Ray flux is at the class < A1 level. The geomagnetic field was at very quiet levels on July 30. No obviously Earth directed CMEs were observed in available LASCO imagery. The Kp index now is at almost quiet levels with Kp=2. 2. Solar Wind Geomagnetic Activity Solar Wind speed from ACE: 350 km/s. Solar Wind speed from STEREO A: 380 km/s. Solar Wind speed from STEREO B: --- km/s. The southward component Bz is: 1 nT south. 3. Solar Energetic Particle Events Protons and electrons are quiet. 4. Coronal Holes A new equatorial coronal hole (CH931) was in Earth facing position on July 28-29. A new equatorial coronal hole (CH932) will be in Earth facing position on August 1-2. 5. Geophysical Activity Forecast The geomagnetic field is expected to be at quiet to unsettled levels on July 31 - August 1 due to CH effects and at quiet levels on August 2. Date Estimated Ap index Expected geom. storm 2019.07.31 07 - 2019.08.01 06 - 2019.08.02 05 - *************************************************************************** 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 ***************************************************************************