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Product: Daily Forecast of Geomagnetic Activity
Issued: 2023 September 14 06:40UTC
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 13.09.2023 at 20:00 UTC was 143 sfu.
The background X-Ray flux is at the class C1.0 level.
The geomagnetic field was at quiet to minor storm (G1) levels on September 13.
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: 457 km/s.
Solar Wind speed from STEREO A: 400 km/s.
Solar Wind speed from STEREO B: - km/s.
The southward component Bz is: 2 nT north

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

4. Coronal Holes
An equatorial coronal hole (CH1172) was Earth facing on September 11-13.

5. Geophysical Activity Forecast
The geomagnetic field is expected to be at quiet to unsettled levels with isolated active periods on September 14-15 due to effects of coronal hole high speed stream and at quiet to unsettled levels on September 16.

   Date      Estimated Ap index      Expected geom. storm
2023.09.14           12                        -
2023.09.15           12                        -
2023.09.16           08                        -

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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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