*********************************************************************** Product: Daily Forecast of Geomagnetic Activity Issued: 2019 September 16 06:27UTC 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 15.09.2019 at 20:00 UTC was 68 sfu. The background X-Ray flux is at the class A6 level. The geomagnetic field was at quiet to unsettled levels on September 15. 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: 445 km/s. Solar Wind speed from STEREO A: 390 km/s. Solar Wind speed from STEREO B: --- km/s. The southward component Bz is: 4 nT north. 3. Solar Energetic Particle Events Protons and electrons are quiet. 4. Coronal Holes A southern hemishere coronal hole (CH937) was in Earth facing position on September 13-14. 5. Geophysical Activity Forecast The geomagnetic field is expected to be at quiet to active levels on September 16-17, with a chance for minor storm intervals, and at quiet to unsettled levels on September 18 due to CH937 effects. Date Estimated Ap index Expected geom. storm 2019.09.16 12 - 2019.09.17 08 - 2019.09.18 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 ***************************************************************************