*********************************************************************** Product: Daily Forecast of Geomagnetic Activity Issued: 2018 September 13 05:50UTC 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 12.09.2018 at 20:00 UTC was 70 sfu. The background X-Ray flux is at the class A2 level. The geomagnetic field was at quiet to unsettled levels on September 12. No obviously Earth directed CMEs were observed in available LASCO imagery. The Kp index now is at active levels with Kp=4. 2. Solar Wind Geomagnetic Activity Solar Wind speed from ACE: 485 km/s. Solar Wind speed from STEREO A: 420 km/s. Solar Wind speed from STEREO B: --- km/s. The southward component Bz is: 2 nT north. 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 finally reached Earth on the first half of September 10 as it was predicted. A new coronal hole (CH885) will be in Earth facing position on September 13-14. 5. Geophysical Activity Forecast The geomagnetic field is expected to be at quiet to unsettled levels, with a chance for active intervals due to CH884 effects, on September 13 and at quiet levels on September 14-15. Date Estimated Ap index Expected geom. storm 2018.09.13 09 - 2018.09.14 05 - 2018.09.15 04 - *************************************************************************** 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 ***************************************************************************