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Product: Daily Forecast of Geomagnetic Activity
Issued: 2019 December 17 07:13UTC
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 16.12.2019 at 20:00 UTC was 70 sfu.
The background X-Ray flux is at the class < A1 level.
The geomagnetic field was at very quiet levels on December 16.
No obviously Earth directed CMEs were observed in available LASCO imagery. 
The Kp index now is at very quiet levels with Kp=0.

2. Solar Wind Geomagnetic Activity
Solar Wind speed from ACE: 350 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
A new small coronal hole (CH947) on the northern hemisphere of the visible solar disk will be in Earth facing position on Dec. 14-15. An associated with this CH high speed stream of solar wind is expected to reach Earth on the first half of December 18.

5. Geophysical Activity Forecast
The geomagnetic field is expected to be at very quiet levels on December 17 and at quiet to active levels on December 18-19 due to CH947 effects.

   Date      Estimated Ap index      Expected geom. storm
2019.12.17           01                        -
2019.12.18           10                        -
2019.12.19           08                        -

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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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