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Product: Daily Forecast of Geomagnetic Activity
Issued: 2017 September 20 06:23UTC
Prepared by the Athens Space Weather Forecasting Center
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1. Solar activity
Solar activity was decreasing stable during the past 24 hours.
Solar Flux (10.7 cm) measured on 19.09.2017 at 20:00 UTC was 71 sfu.
The background X-Ray flux is at the class A4 level.
The geomagnetic field was at very quiet to unsettled levels on September 19.
No obviously Earth directed CMEs were observed in available LASCO imagery.
The Kp index now is at unsettled levels with Kp=3.

2. Solar Wind Geomagnetic Activity
Solar Wind speed from ACE: 480 km/s.
Solar Wind speed from STEREO A: 780 km/s.
Solar Wind speed from STEREO B: --- km/s.
The southward component Bz is: 0 nT.

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

4. Coronal Holes
A new coronal hole (CH825) at the southern hemisphere of the visible solar disk will be in Earth facing position on September 19-21.

5. Geophysical Activity Forecast
The geomagnetic field is expected to be at quiet to unsettled levels on September 20 and at mostly quiet levels on September 21-22.

Date Estimated Ap index Expected geom. storm
2017.09.20 09 -
2017.09.21 05 -
2017.09.22 04 -

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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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