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Product: Daily Forecast of Geomagnetic Activity
Issued: 2019 April 23 05:42UTC
Prepared by the Athens Space Weather Forecasting Center
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1. Solar activity
Solar activity was almost stable during the past 24 hours.
Solar Flux (10.7 cm) measured on 22.04.2019 at 20:00 UTC was 69 sfu.
The background X-Ray flux is at the class A6 level.
The geomagnetic field was at very quiet levels on April 22.
No obviously Earth directed CMEs were observed in available LASCO imagery.
The Kp index now is at quiet levels with Kp=1.

2. Solar Wind Geomagnetic Activity
Solar Wind speed from ACE: 360 km/s.
Solar Wind speed from STEREO A: 320 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
A new small coronal hole (CH915) on the southern hemisphere of the visible solar disk will be in Earth facing position on April 19-22. A high speed stream of solar wind from this CH is expected on the first half of April 23.

5. Geophysical Activity Forecast
The geomagnetic field is expected to be at very quiet to unsettled levels on April 23 and at quiet to unsettled levels, with a chance for active intervals, on April 24-25 due to CH915 effects.

   Date      Estimated Ap index      Expected geom. storm
2019.04.23           05                        -
2019.04.24           08                        -
2019.04.25           10                        -

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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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