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Product: Daily Forecast of Geomagnetic Activity
Issued: 2018 January 23 07:28UTC
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 22.01.2018 at 20:00 UTC was 70 sfu.
The background X-Ray flux is at the class A2 level.
The geomagnetic field was at quiet to unsettled levels on January 21.
A solar flare of B9 magnitude noticed  on the first hours of January 22. A CME associated with this solar flare noticed around 03:30 UT. This CME it is not an Earth directed CME but it is possible to have an Earth directed component. In this case the arrival of the shock, according our EAM model, is expected on the first hours of January 25 at around 07:00UT.
The Kp index now is at unsettled levels with Kp=3.

2. Solar Wind Geomagnetic Activity
Solar Wind speed from ACE: 475 km/s.
Solar Wind speed from STEREO A: 510 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 (CH848) was in Earth facing position on January 16-20. A high speed stream of solar wind from this CH has arrived and caused minor effects up to now.

5. Geophysical Activity Forecast
The geomagnetic field is expected to be at quiet to unsettled levels on January 23, due to CH848 effects and at quiet levels on January 24-25.

   Date      Estimated Ap index      Expected geom. storm
2018.01.23           04                        -
2018.01.24           03                        -
2018.01.25           02                        -

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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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