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Product: Daily Forecast of Geomagnetic Activity
Issued: 2017 December 22 14:16UTC
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 21.12.2017 at 20:00 UTC was 76 sfu.
The background X-Ray flux is at the class Β1 level.
The geomagnetic field was at very quiet levels on December 21.
No obviously Earth directed CMEs were observed in available LASCO magery.
The Kp index now is at very quiet levels with Kp=0.

2. Solar Wind Geomagnetic Activity
Solar Wind speed from ACE: 320 km/s.
Solar Wind speed from STEREO A: 630 km/s.
Solar Wind speed from STEREO B: --- km/s.
The southward component Bz is: 1 nT north.

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

4. Coronal Holes
A coronal hole (CH843) was in Earth facing position on December 20-21. An extension of this CH will be in Earth facing position on December 22-24.

5. Geophysical Activity Forecast
The geomagnetic field is expected to be at very quiet levels on December 22 and at quiet to unsettled levels on December 23-24 due to CH843 effects.

   Date      Estimated Ap index      Expected geom. storm
2017.12.22           01                        -
2017.12.23           05                        -
2017.12.24           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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