*********************************************************************** Product: Daily Forecast of Geomagnetic Activity Issued: 2018 September 10 06:19UTC 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 09.09.2018 at 20:00 UTC was A2 sfu. The background X-Ray flux is at the class 68 level. The geomagnetic field was at quiet to unsettled levels on September 9. 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: 360 km/s. Solar Wind speed from STEREO A: 560 km/s. Solar Wind speed from STEREO B: --- km/s. The southward component Bz is: 1 nT south. 3. Solar Energetic Particle Events Protons and electrons are quiet. 4. Coronal Holes A new equatorial coronal hole (CH884) will be in Earth facing position on September 7-8. A high speed stream of solar wind is expected to reach Earth on the first half of September 10. 5. Geophysical Activity Forecast The geomagnetic field is expected to be at very quiet to active conditions, with a chance for minor storm intervals, on September 10, at unsettled to moderate storm levels on September 11 and at unsettled to minor storm levels on September 12 due to CH884 effects. Date Estimated Ap index Expected geom. storm 2018.09.10 11 - 2018.09.11 26 G1 - G2 2018.09.12 14 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 ***************************************************************************