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Product: Daily Forecast of Geomagnetic Activity
Issued: 2021 February 18 06:22UTC
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 17.02.2021 at 20:00 UTC was 72 sfu.
The background X-Ray flux is at the class A5.1 level.
The geomagnetic field was at quiet to unsettled levels on February 17.
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: 390 km/s.
Solar Wind speed from STEREO A: --- km/s.
Solar Wind speed from STEREO B: --- km/s.
The southward component Bz is: 3 nT south.

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

4. Coronal Holes
A new coronal hole (CH995) on the southern hemisphere of the visible solar disk will be in Earth facing position on Feb. 17-18. A high speed stream from CH995 is expected to reach Earth on the first half of Feb. 21.

5. Geophysical Activity Forecast
The geomagnetic field is expected to be at quiet to unsettled levels on Feb. 18 and at quiet levels on Feb. 19-20.

   Date      Estimated Ap index      Expected geom. storm
2021.02.18           05                        -
2021.02.19           03                        -
2021.02.20           02                        -

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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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