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Product: Daily Forecast of Geomagnetic Activity
Issued: 2021 April 15 05:40UTC
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 14.04.2021 at 20:00 UTC was 74 sfu.
The background X-Ray flux is at the class A3.4 level.
The geomagnetic field was at quiet to active levels on April 14.
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: 415 km/s.
Solar Wind speed from STEREO A: --- km/s.
Solar Wind speed from STEREO B: --- km/s.
The southward component Bz is: 7 nT south.

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

4. Coronal Holes
A new equatorial coronal hole (CH1006) was in Earth facing position on April 13. 
An extension of the southern polar coronal hole (CH1007) will be in Earth facing position on April 14-15.

5. Geophysical Activity Forecast
The geomagnetic field is expected to be at quiet to unsettled levels on April 15, at almost quiet to active levels on April 16 and at unsettled to minor storm levels on April 17.

   Date      Estimated Ap index      Expected geom. storm
2021.04.15           08                        -
2021.04.16           13                        -
2021.04.17           19                        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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