*********************************************************************** Product: Daily Forecast of Geomagnetic Activity Issued: 2018 January 01 09:58UTC 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 31.12.2017 at 20:00 UTC was 71 sfu. The background X-Ray flux is at the class A3 level. The geomagnetic field was at very quiet levels on December 31. No obviously Earth directed CMEs were observed in available LASCO magery. The Kp index now is at almost quiet levels with Kp=2. 2. Solar Wind Geomagnetic Activity Solar Wind speed from ACE: 430 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 coronal hole (CH844) in the northern hemisphere of the visible solar disk will be in Earth facing position on December 28-30. 5. Geophysical Activity Forecast The geomagnetic field is expected to be at quiet to active levels with a chance for minor storm levels on January 1-3 due to CH844 effects. Date Estimated Ap index Expected geom. storm 2018.01.01 13 - 2018.01.02 12 - 2018.01.03 10 - *************************************************************************** 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 ***************************************************************************