*********************************************************************** Product: Daily Forecast of Geomagnetic Activity Issued: 2018 September 15 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 14.09.2018 at 20:00 UTC was 69 sfu. The background X-Ray flux is at the class A2 level. The geomagnetic field was at almost quiet to minor storm levels on September 14. 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: 575 km/s. Solar Wind speed from STEREO A: 470 km/s. Solar Wind speed from STEREO B: --- km/s. The southward component Bz is: 2 nT south. 3. Solar Energetic Particle Events Protons and electrons are quiet. 4. Coronal Holes 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 levels on September 15-16, with a chance for unsettled intervals, and at quiet to active levels on September 17 due to CH885 effects. Date Estimated Ap index Expected geom. storm 2018.09.15 05 - 2018.09.16 04 - 2018.09.17 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 ***************************************************************************