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Product: Daily Forecast of Geomagnetic Activity
Issued: 2017 May 28 07:24UTC
Prepared by the Athens Space Weather Forecasting Center
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1. Solar activity
Solar activity was increasing during the past 24 hours.
Solar Flux (10.7 cm) measured on 27.05.2017 at 20:00 UTC was 82 sfu.
The background X-Ray flux is at the class B1 level.
The geomagnetic field was at very quiet to moderate storm (G2) levels on May 26 due to May 23 CME which succesfully predicted that will reach Earth on the second half of May 27.
No obviously Earth directed CMEs were observed in available LASCO imagery.
The Kp index now is at strong storm levels with Kp=7.

2. Solar Wind Geomagnetic Activity
Solar Wind speed from ACE: 370 km/s.
Solar Wind speed from STEREO A: 350 km/s.
Solar Wind speed from STEREO B: --- km/s.
The southward component Bz is: 12 nT south.

3. Solar Energetic Particle Events
Protons and electrons are quiet.

4. Coronal Holes
No obvious coronal holes are currently in the visible solar disk.

5. Geophysical Activity Forecast
The geomagnetic field is expected to be at active to strong storm levels on May 28 due to effects from the arrival of the faint CME of May 23 and at quiet to unsettled levels on May 29-30.

Date Estimated Ap index Expected geom. storm
2017.05.28 45 G2 - G3
2017.05.29 12 -
2017.05.30 07 -

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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
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