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Product: Daily Forecast of Geomagnetic Activity
Issued: 2020 October 21 05:33UTC
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 20.10.2020 at 20:00 UTC was 75 sfu.
The background X-Ray flux is at the class A2.2 level.
The geomagnetic field was at quiet levels on October 20.
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: 360 km/s.
Solar Wind speed from STEREO A: 440 km/s.
Solar Wind speed from STEREO B: --- km/s.
The southward component Bz is: 1 nT south.

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

4. Coronal Holes
A coronal hole (CH975) on the southern hemisphere was in Earth facing position on Oct. 17-18. A new structure (CH976) on the northern hemisphere will be in Earth facing position on Oct. 19-22.

5. Geophysical Activity Forecast
The geomagnetic field is expected to be at quiet to active levels, on October 21 and at quiet to minor storm levels on October 22-23 due to CH effects.

   Date      Estimated Ap index      Expected geom. storm
2020.10.21           11                        -
2020.10.22           15                        G1
2020.10.23           16                        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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