*********************************************************************** Product: Daily Forecast of Geomagnetic Activity Issued: 2019 August 30 07:24UTC 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 29.08.2019 at 20:00 UTC was 66 sfu. The background X-Ray flux is at the class A6 level. The geomagnetic field was at very quiet levels on August 29. 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: 395 km/s. Solar Wind speed from STEREO A: 325 km/s. Solar Wind speed from STEREO B: --- km/s. The southward component Bz is: 2 nT south. 3. Solar Energetic Particle Events Protons and electrons are quiet. 4. Coronal Holes An equatorial coronal hole (CH935) of the visible solar disk was in Earth facing position on August 27-29. A high speed stream of solar wind is expected to reach Earth on the first half of August 31. 5. Geophysical Activity Forecast The geomagnetic field is expected to be at quiet levels on August 30, at quiet to minor storm levels, with a chance for moderate storm levels, on August 31 and at unsettled to moderate storm levels on September 1 due to CH935 effects. Date Estimated Ap index Expected geom. storm 2019.08.30 05 - 2019.08.31 20 G1 - G2 2019.09.01 30 G2 *************************************************************************** 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 ***************************************************************************