*********************************************************************** Product: Daily Forecast of Geomagnetic Activity Issued: 2019 January 04 05:53UTC 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 03.01.2019 at 20:00 UTC was 73 sfu. The background X-Ray flux is at the class A3 level. The geomagnetic field was at very quiet levels on January 3. 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: 310 km/s. Solar Wind speed from STEREO A: 350 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 An equatorial coronal hole (CH902) was in Earth facing position on December 31 - January 2. A high speed stream of solar wind is expected to reach Earth on the first half of January 4. 5. Geophysical Activity Forecast The geomagnetic field is expected to be at very quiet to active levels on January 4 and at unsettled to minor storm levels on January 5-6 due to CH902 effects. Date Estimated Ap index Expected geom. storm 2019.01.04 09 - 2019.01.05 24 G1 2019.01.06 20 G1 *************************************************************************** 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 ***************************************************************************