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Product: Daily Forecast of Geomagnetic Activity
Issued: 2023 April 26 07:58UTC
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 25.04.2023 at 20:00 UTC was 134 sfu.
The background X-Ray flux is at the class B9.8 level.
The geomagnetic field was at quiet to unsettled levels on April 25.
A CME was visible to the south in SOHO LASCO C2/C3 and STEREO A COR2 imagery. The source is a filament eruption centered around S35W25 starting on April 24 around 13:20UT. This CME could reach Earth on April 27 between at 10:16 UT and at 11:37 UT according to EAM predictions.
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: 507 km/s.
Solar Wind speed from STEREO A: - km/s.
Solar Wind speed from STEREO B: - km/s.
The southward component Bz is: 2 nT south.

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

4. Coronal Holes
A recurrent equatorial coronal hole (CH1142) will become Earth facing on April 23-26.

5. Geophysical Activity Forecast
The geomagnetic field is expected to be at quiet to unsettled on April 26 and at unsettled to minor storm (G1) levels on April 27-28 due to the effects of CME observed on April 24 and the coronal hole high speed stream.

   Date      Estimated Ap index      Expected geom. storm
2023.04.26           08                        -
2023.04.27           20                        G1
2023.04.28           25                        G1

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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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