*********************************************************************** Product: Daily Forecast of Geomagnetic Activity Issued: 2018 July 31 05:12UTC 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 30.07.2018 at 20:00 UTC was 68 sfu. The background X-Ray flux is at the class A2 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: 310 km/s. Solar Wind speed from STEREO A: 320 km/s. Solar Wind speed from STEREO B: --- km/s. The southward component Bz is: 4 nT north. 3. Solar Energetic Particle Events Protons and electrons are quiet. 4. Coronal Holes A small coronal hole (CH877) will be in Earth facing position on August 1. 5. Geophysical Activity Forecast The geomagnetic field is expected to be at very quiet levels on July 31 - August 2. Date Estimated Ap index Expected geom. storm 2018.07.31 03 - 2018.08.01 03 - 2018.08.02 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 ***************************************************************************