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Product: Daily Forecast of Geomagnetic Activity
Issued: 2016 May 17 05:40UTC
Prepared by the Athens Space Weather Forecasting Center
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1. Solar activity
Solar activity was almost stable during the past 24 hours.
Solar Flux (10.7 cm) measured on 16.05.2016 at 20:00 UTC was 103 sfu.
The background X-Ray flux is at the class B3 level.
The geomagnetic field was at quiet to unsettled levels on May 15.
Finally, the solar wind stream from CH 734 it was ineffective for Earth's magnetosphere. 
No obviously Earth directed CMEs were observed in available LASCO imagery.
The Kp index now is at quiet levels with Kp=2.

2. Solar Wind Geomagnetic Activity
Solar Wind speed from ACE: 500 km/s.
Solar Wind speed from STEREO A: 460 km/s.
Solar Wind speed from STEREO B: --- km/s.
The southward component of Bz is: 2 nT north.

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

4. Coronal Holes
A recurrent northern hemisphere coronal hole (CH734) rotated across the central meridian on May 12-13, no disturbance was associated with the CH on the previous rotation. A recurrent trans equatorial extension (CH735) of the northern polar coronal hole will likely rotate into an Earth facing position on May 16-18.

5. Geophysical Activity Forecast
The geomagnetic field is expected to be at quiet to unsettled levels on May 17-19.

    Date         Estimated Geomagnetic Ap index
2016.05.17                    10
2016.05.18                    12
2016.05.19                    12

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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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