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Product: Daily Forecast of Geomagnetic Activity
Issued: 2021 April 26 05:47UTC
Prepared by the Athens Space Weather Forecasting Center
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1. Solar activity
Solar activity was increasing during the past 24 hours.
Solar Flux (10.7 cm) measured on 25.04.2021 at 20:00 UTC was 79 sfu.
The background X-Ray flux is at the class B1.1 level.
The geomagnetic field was at almost quiet to minor storm levels on April 25.
No obviously Earth directed CMEs were observed in available LASCO imagery.
The April 22 CME finally arrived on April 24 at ~22:30 UT. The prediction of the Time-of-Arrival from EAM model was between 18:30 (EAMv2) and 25/04 00:43 (EAMv3).
The Kp index now is at active levels with Kp=4.

2. Solar Wind Geomagnetic Activity
Solar Wind speed from ACE: 460 km/s.
Solar Wind speed from STEREO A: 360 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 new coronal hole (CH1010) on the northern hemisphere of the visible solar disk will be in Earth facing position on April 26-27.

5. Geophysical Activity Forecast
The geomagnetic field is expected to be at almost quiet to minor storm (G1) levels on April 26, at almost quiet levels on April 27 and at quiet levels on April 28.

   Date      Estimated Ap index      Expected geom. storm
2021.04.26           16                        G1
2021.04.27           08                        -
2021.04.28           05                        -

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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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