*********************************************************************** Product: Daily Forecast of Geomagnetic Activity Issued: 2019 May 09 07:38UTC Prepared by the Athens Space Weather Forecasting Center *********************************************************************** 1. Solar activity Solar activity was decreasing stable during the past 24 hours. Solar Flux (10.7 cm) measured on 08.05.2019 at 20:00 UTC was 75 sfu. The background X-Ray flux is at the class B1 level. The geomagnetic field was at very quiet levels on May 8. AR2740 produced a (possible) Earth directed CME on May 7 at ~05:00UT. The expected date and time of arrival for this CME is 11/05/2019 - 11:30UT The Kp index now is at almost quiet levels with Kp=2. 2. Solar Wind Geomagnetic Activity Solar Wind speed from ACE: 325 km/s. Solar Wind speed from STEREO A: 390 km/s. Solar Wind speed from STEREO B: --- km/s. The southward component Bz is: 1 nT north. 3. Solar Energetic Particle Events Protons and electrons are quiet. 4. Coronal Holes A small equatorial coronal hole (CH917) was in Earth facing position on May 3-4. 5. Geophysical Activity Forecast The geomagnetic field is expected to be at quiet levels with a chance for unsettled intervals on May 9 due to CH917 weak effects, at very quiet levels on May 10 and at very quiet to active levels on May 11 due to the arrival of CME. Date Estimated Ap index Expected geom. storm 2019.05.09 04 - 2019.05.10 03 - 2019.05.11 13 - *************************************************************************** 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 ***************************************************************************