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Product: Daily Forecast of Geomagnetic Activity
Issued: 2017 April 18 05:25UTC
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 17.04.2017 at 20:00 UTC was 75 sfu.
The background X-Ray flux is at the class B1 level.
The geomagnetic field was at very quiet to almost quiet levels on April 17. 
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: 330 km/s.
Solar Wind speed from STEREO A: 370 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
An extension of coronal hole CH801 was in Earth facing position on April 15-16.
A high speed stream from this CH should arrive on Earth on second half of April 18.

5. Geophysical Activity Forecast
The geomagnetic field is expected to be at quiet to active levels on April 18, at unsettled to minor storm levels on April 19 due to CH801 effects and at quiet to unsettled levels on April 20.

   Date      Estimated Ap index      Expected geom. storm
2017.04.18           10                        -
2017.04.19           22                        G1
2017.04.20           12                        -

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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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