*********************************************************************** Product: Daily Forecast of Geomagnetic Activity Issued: 2018 June 25 05:19UTC 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 24.06.2018 at 20:00 UTC was 75 sfu. The background X-Ray flux is at the class B1 level. The geomagnetic field was at quiet to unsettled levels on June 24. 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: 460 km/s. Solar Wind speed from STEREO A: 500 km/s. Solar Wind speed from STEREO B: --- km/s. The southward component Bz is: 0 nT. 3. Solar Energetic Particle Events Protons and electrons are quiet. 4. Coronal Holes A new coronal hole (CH871) in the southern hemisphere of the visible solar disk will be in Earth facing position on June 24-26. A high speed stream of solar wind is expected to reach Earth on the second half of June 26. 5. Geophysical Activity Forecast The geomagnetic field is expected to be at almost quiet levels on June 25, at quiet to active levels on June 26 and at unsettled to minor storm levels on June 27 due to CH871 effects. Date Estimated Ap index Expected geom. storm 2018.06.25 07 - 2018.06.26 12 - 2018.06.27 20 G1 *************************************************************************** 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 ***************************************************************************