*********************************************************************** Product: Daily Forecast of Geomagnetic Activity Issued: 2018 June 01 06:03UTC Prepared by the Athens Space Weather Forecasting Center *********************************************************************** 1. Solar activity Solar activity was increasing during the past 24 hours. Solar Flux (10.7 cm) measured on 31.05.2018 at 20:00 UTC was 77 sfu. The background X-Ray flux is at the class A8 level. The geomagnetic field was at quiet to active levels on May 31. No obviously Earth directed CMEs were observed in available LASCO imagery. The Kp index now is at unsettled levels with Kp=3. 2. Solar Wind Geomagnetic Activity Solar Wind speed from ACE: 565 km/s. Solar Wind speed from STEREO A: 320 km/s. Solar Wind speed from STEREO B: --- km/s. The southward component Bz is: 3 nT north. 3. Solar Energetic Particle Events Protons and electrons are quiet. 4. Coronal Holes A new coronal hole (CH867) close to the equator of the visible solar disk will be in Earth facing position on May 29-31. A high speed stream of solar wind reached Earth on the second half of May 31, earlier than it was predicted. 5. Geophysical Activity Forecast The geomagnetic field is expected to be at unsettled to minor storm levels on June 01-02, with a chance for moderate storm intervals, due to CH867 effects, and at quiet to unsettled levels on June 03. Date Estimated Ap index Expected geom. storm 2018.06.01 24 G1 - G2 2018.06.02 26 G1 - G2 2018.06.03 12 - *************************************************************************** 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 ***************************************************************************