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Product: Daily Forecast of Geomagnetic Activity
Issued: 2021 September 05 07:13UTC
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 04.09.2021 at 20:00 UTC was 86 sfu.
The background X-Ray flux is at the class B3.0 level.
The geomagnetic field was at very quiet levels on September 4.
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: 400 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 south.

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

4. Coronal Holes
A new coronal hole (CH1028) on the southern hemisphere of the visible solar disk will be in Earth facing position on Sep. 1.

5. Geophysical Activity Forecast
The geomagnetic field is expected to be at quiet to unsettled levels on Sep. 5-6 due to CH1028 effects and at quiet levels on Sep. 7..

   Date      Estimated Ap index      Expected geom. storm
2021.09.05           07                        -
2021.09.06           06                        -
2021.09.07           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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