*********************************************************************** Product: Daily Forecast of Geomagnetic Activity Issued: 2019 June 04 05:21UTC 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 03.06.2019 at 20:00 UTC was 70 sfu. The background X-Ray flux is at the class A7 level. The geomagnetic field was at very quiet levels on June 3. 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: 330 km/s. Solar Wind speed from STEREO A: 315 km/s. Solar Wind speed from STEREO B: --- km/s. The southward component Bz is: 3 nT south. 3. Solar Energetic Particle Events Protons and electrons are quiet. 4. Coronal Holes A new coronal hole (CH921) on the northern hemisphere of the visible solar disk was in Earth facing position on May 31 - June 2. Weak effects from this CH are expected between the second half of June 3 and the first half of June 4. 5. Geophysical Activity Forecast The geomagnetic field is expected to be at quiet to unsettled levels on June 4-5 due to weak CH921 effects and at very quiet levels on June 6. Date Estimated Ap index Expected geom. storm 2019.06.04 04 - 2019.06.05 04 - 2019.06.06 03 - *************************************************************************** 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 ***************************************************************************