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Product: Daily Forecast of Geomagnetic Activity
Issued: 2017 July 10 06:27UTC
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 09.07.2017 at 20:00 UTC was 91 sfu.
The background X-Ray flux is at the class B2 level.
The geomagnetic field was at almost quiet to minor storm (G1) levels on July 9 due to CH812 effects.
No obviously Earth directed CMEs were observed in available LASCO imagery.
A M1.3 solar flare noticed on July 9 at around 03:18 UT from AR12665.
The Kp index now is at active levels with Kp=4.

2. Solar Wind Geomagnetic Activity
Solar Wind speed from ACE: 610 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 (CH812) was in Earth facing position on July 05-07. A high speed stream of solar wind from this CH finally reached Earth on the last hours of July 08.

5. Geophysical Activity Forecast
The geomagnetic field is expected to be at unsettled to minor storm levels on July 10 due to effects from CH812 and at quiet to unsettled on July 11-12. Isolated moderate storm levels are also possible for this period.

   Date      Estimated Ap index      Expected geom. storm
2017.07.10           17                        G1
2017.07.11           11                        -
2017.07.12           09                        -

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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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