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Product: Daily Forecast of Geomagnetic Activity
Issued: 2021 May 25 06:52UTC
Prepared by the Athens Space Weather Forecasting Center
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1. Solar activity
Solar activity was decreasing stable during the past 24 hours.
Solar Flux (10.7 cm) measured on 24.05.2021 at 20:00 UTC was 73 sfu.
The background X-Ray flux is at the class B1.1 level.
The geomagnetic field was at very quiet levels on May 24. 
AR2824 produced in less than 24 hours a dozen of solar flares (10C-class and 2M-class) and many CMEs. Several CMEs are expected to reach Earth, probably not directly but an impact due to the flanks is very probable. Arrivals are expected on May 25-26. For more information and detailed predictions please visit NASAs/CME Scoreboard to see EAM forecasts. 
The Kp index now is at quiet levels with Kp=1.

2. Solar Wind Geomagnetic Activity
Solar Wind speed from ACE: 315 km/s.
Solar Wind speed from STEREO A: --- 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
No obvious coronal holes are currently in the visible solar disk.

5. Geophysical Activity Forecast
The geomagnetic field is expected to be at quiet to minor storm levels on May 25, at unsettled to strong geomagnetic storm levels on May 26-27 due to several CME arrivals.

   Date      Estimated Ap index      Expected geom. storm
2021.05.25           13                        G1
2021.05.26           46                        G1 - G3
2021.05.27           23                        G1 - G2

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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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