*********************************************************************** Product: Daily Forecast of Geomagnetic Activity Issued: 2019 October 26 04:26UTC 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 25.10.2019 at 20:00 UTC was 66 sfu. The background X-Ray flux is at the class A7 level. The geomagnetic field was at unsettled to moderate storm (G2) levels on October 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: 575 km/s. Solar Wind speed from STEREO A: 480 km/s. Solar Wind speed from STEREO B: --- km/s. The southward component Bz is: 5 nT south. 3. Solar Energetic Particle Events Protons and electrons are quiet. 4. Coronal Holes A new equatorial coronal hole (CH941) was in Earth facing position on October 20-23. A high speed stream of solar wind from CH941 finally reached Earth on the first half of October 24 causing active intervals. 5. Geophysical Activity Forecast The geomagnetic field is expected to be at unsettled to minor storm levels, with a chance for moderate storm intervals, on October 26, at unsettled to active levels on October 27 and at quiet to unsettled levels due to CH941 effects. Date Estimated Ap index Expected geom. storm 2019.10.26 24 G1 2019.10.27 18 - 2019.10.28 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 ***************************************************************************