*********************************************************************** Product: Daily Forecast of Geomagnetic Activity Issued: 2018 May 06 07:07UTC 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 05.05.2018 at 20:00 UTC was 68 sfu. The background X-Ray flux is at the class A2 level. The geomagnetic field was at very quiet to minor storm levels on May 5. No obviously Earth directed CMEs were observed in available LASCO imagery. The Kp index now is at active levels with Kp=4. 2. Solar Wind Geomagnetic Activity Solar Wind speed from ACE: 650 km/s. Solar Wind speed from STEREO A: 290 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 new equatorial coronal hole (CH863) will be in Earth facing position on May 2-5. A high speed stream of solar wind finally arrived on Earth on the second half of May 5 some hours ahead of our prediction. The stream arrived earlier as it was faster than it was expected. 5. Geophysical Activity Forecast The geomagnetic field is expected to be at unsettled to minor storm levels on May 6-7, with a chance for moderate storm intervals, and at unsettled to active levels on May 8 due to CH863 effects. Date Estimated Ap index Expected geom. storm 2018.05.06 27 G1 - G2 2018.05.07 20 G1 2018.05.08 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 ***************************************************************************