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Product: Daily Forecast of Geomagnetic Activity
Issued: 2018 December 26 05:44UTC
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 25.12.2018 at 20:00 UTC was 70 sfu.
The background X-Ray flux is at the class A2 level.
The geomagnetic field was at very quiet levels on December 25.
No obviously Earth directed CMEs were observed in available LASCO imagery.
The Kp index now is at quiet levels with Kp=1.

2. Solar Wind Geomagnetic Activity
Solar Wind speed from ACE: 355 km/s.
Solar Wind speed from STEREO A: 450 km/s.
Solar Wind speed from STEREO B: --- km/s.
The southward component Bz is: 0 nT.

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

4. Coronal Holes
A new equatorial coronal hole (CH901) was in Earth facing position on December 23-25.

5. Geophysical Activity Forecast
The geomagnetic field is expected to be at very quiet levels on December 26 and at quiet to unsettled levels on December 27-28 due to CH901 effects.

   Date      Estimated Ap index      Expected geom. storm
2018.12.26           01                        -
2018.12.27           03                        -
2018.12.28           06                        -

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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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