*********************************************************************** Product: Daily Forecast of Geomagnetic Activity Issued: 2019 January 21 08:12UTC 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 20.01.2019 at 20:00 UTC was 69 sfu. The background X-Ray flux is at the class A1 level. The geomagnetic field was at very quiet levels on January 20. 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: 320 km/s. Solar Wind speed from STEREO A: 530 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 A new equatorial coronal hole (CH904) will be in Earth facing position on January 19-21. A high speed stream of solar wind is expected to reach Earth on January 23. 5. Geophysical Activity Forecast The geomagnetic field is expected to be at very quiet levels on January 21-22 and at quiet to active levels, with a chance for minor storm intervals, on January 23 due to CH904 effects. Date Estimated Ap index Expected geom. storm 2019.01.21 02 - 2019.01.22 01 - 2019.01.23 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 ***************************************************************************