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Product: Daily Forecast of Geomagnetic Activity
Issued: 2017 June 26 06:12UTC
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 25.06.2017 at 20:00 UTC was 74 sfu.
The background X-Ray flux is at the class A5 level.
The geomagnetic field was at quiet to active levels on June 25.
No obviously Earth directed CMEs were observed in available LASCO imagery.
The Kp index now is at almost quiet levels with Kp=2.

2. Solar Wind Geomagnetic Activity
Solar Wind speed from ACE: 510 km/s.
Solar Wind speed from STEREO A: 380 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 (CH809) was in Earth facing position on June 19-21. The high speed stream of solar wind from this CH finally reached Earth on the last hours of June 21 without important impact on Earth's magnetosphere. A new coronal hole (CH810) was in Earth facing position on June 25. A high speed stream  of solar wind from this CH expected to reach Earth on the first hours of June 27.

5. Geophysical Activity Forecast
The geomagnetic field is expected to be at quiet to unsettled levels on June 26 and at quiet to active levels on June 27-28 due to CH810 effects.

   Date      Estimated Ap index      Expected geom. storm
2017.06.26           07                        -
2017.06.27           12                        -
2017.06.28           10                        -

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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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