*********************************************************************** Product: Daily Forecast of Geomagnetic Activity Issued: 2019 October 24 06:35UTC Prepared by the Athens Space Weather Forecasting Center *********************************************************************** 1. Solar activity Solar activity was almost stable during the past 24 hours. Solar Flux (10.7 cm) measured on 23.10.2019 at 20:00 UTC was 65 sfu. The background X-Ray flux is at the class A7 level. The geomagnetic field was at very quiet levels on October 23. No obviously Earth directed CMEs were observed in available LASCO imagery. The Kp index now is at almost quiet levels with Kp=2. 2. Solar Wind Geomagnetic Activity Solar Wind speed from ACE: 345 km/s. Solar Wind speed from STEREO A: 430 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 new equatorial coronal hole (CH941) was in Earth facing position on October 20-23. A high speed stream of solar wind from CH941 is expected to reach Earth on the first half of October 24. 5. Geophysical Activity Forecast The geomagnetic field is expected to be at quiet to minor storm levels on October 24, at unsettled to minor storm levels, with a chance for moderate storm intervals, on October 25 and at unsettled to active levels on October 26 due to CH941 effects. Date Estimated Ap index Expected geom. storm 2019.10.24 22 G1 2019.10.25 32 G1 - G2 2019.10.26 18 - *************************************************************************** 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 ***************************************************************************