*********************************************************************** Product: Daily Forecast of Geomagnetic Activity Issued: 2018 September 19 05:23UTC 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 18.09.2018 at 20:00 UTC was 68 sfu. The background X-Ray flux is at the class ‘2 level. The geomagnetic field was at quiet to unsettled levels on September 18. 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: 485 km/s. Solar Wind speed from STEREO A: 310 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 An extension of the northern polar coronal hole (CH886) it will be in Earth facing position on September 17-19 but it is not expected to be geoeffective due to mid-latitude position. A new equatorial coronal hole (CH887) is expected to be in Earth facing position on September 19-21. 5. Geophysical Activity Forecast The geomagnetic field is expected to be at quiet levels, with a chance for unsettled intervals, on September 19-21 due to CH885 and CH886 effects. Date Estimated Ap index Expected geom. storm 2018.09.19 05 - 2018.09.20 04 - 2018.09.21 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 ***************************************************************************