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Product: Daily Forecast of Geomagnetic Activity
Issued: 2017 October 22 07:54UTC
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 21.10.2017 at 20:00 UTC was 77 sfu.
The background X-Ray flux is at the class A6 level.
The geomagnetic field was at quiet to unsettled levels on October 21.
No obviously Earth directed CMEs were observed in available LASCO imagery.
The Kp index now is at almost quiet levels with Kp=2.

2. Solar Wind Geomagnetic Activity
Solar Wind speed from ACE: 415 km/s.
Solar Wind speed from STEREO A: 390 km/s.
Solar Wind speed from STEREO B: --- km/s.
The southward component Bz is: 4 nT north.

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

4. Coronal Holes
An equatorial coronal hole (CH830) was in Earth facing position on October 17-18. A new coronal hole (CH831) in the northern hemisphere of the visible solar disk will be in Earth facing position on October 20-22.

5. Geophysical Activity Forecast
The geomagnetic field is expected to be at quiet to unsettled levels on October 22 due to CH830 effects and at quiet to minor storm levels on October 23-24 due to CH831 effects.

   Date      Estimated Ap index      Expected geom. storm
2017.10.22           06                        -
2017.10.23           08                        G1
2017.10.24           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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