*********************************************************************** Product: Daily Forecast of Geomagnetic Activity Issued: 2019 April 04 05:46UTC 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 03.04.2019 at 20:00 UTC was 71 sfu. The background X-Ray flux is at the class < A1 level. The geomagnetic field was at almost quiet to active levels on April 3. 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: 385 km/s. Solar Wind speed from STEREO A: 330 km/s. Solar Wind speed from STEREO B: --- km/s. The southward component Bz is: 1 nT south. 3. Solar Energetic Particle Events Protons and electrons are quiet. 4. Coronal Holes A new small coronal hole (CH913) in the northern hemisphere of the visible solar disk was in Earth facing position on March 28. An extension (CH914) of the southern polar coronal hole will be in Earth facing position on March 30 - April 2. 5. Geophysical Activity Forecast The geomagnetic field is expected to be at quiet to unsettled levels on April 4-6 due to CH914 weak effects. Date Estimated Ap index Expected geom. storm 2019.04.04 06 - 2019.04.05 07 - 2019.04.06 08 - *************************************************************************** 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 ***************************************************************************