*********************************************************************** Product: Daily Forecast of Geomagnetic Activity Issued: 2018 March 26 04:30UTC 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 25.03.2018 at 20:00 UTC was 68 sfu. The background X-Ray flux is at the class A1 level. The geomagnetic field was at quiet to active levels on March 25. 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: 500 km/s. Solar Wind speed from STEREO A: 520 km/s. Solar Wind speed from STEREO B: --- km/s. The southward component Bz is: 3 nT south. 3. Solar Energetic Particle Events Protons and electrons are quiet. 4. Coronal Holes A coronal hole (CH858) which is an extension of the southern polar coronal hole was in Earth facing position and caused up to now active intervals. A new coronal hole (CH859) will be in Earth facing position on March 25-27. 5. Geophysical Activity Forecast The geomagnetic field is expected to be at almost quiet to active levels on March 26 with a chance for minor storm intervals and at quiet to unsettled levels on March 27-28 due to CH858 effects. Date Estimated Ap index Expected geom. storm 2018.03.26 11 - 2018.03.27 08 - 2018.03.28 05 - *************************************************************************** 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 ***************************************************************************