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Product: Daily Forecast of Geomagnetic Activity
Issued: 2017 August 31 06:17UTC
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 30.08.2017 at 20:00 UTC was 87 sfu.
The background X-Ray flux is at the class B1 level.
The geomagnetic field was at very quiet levels on August 30.
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: 430 km/s.
Solar Wind speed from STEREO A: 660 km/s.
Solar Wind speed from STEREO B: --- km/s.
The southward component Bz is: 7 nT north.

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

4. Coronal Holes
A coronal hole (CH822) on the northern hemisphere of the visible solar disk was in Earth facing position on August 27-30. A high speed stream of solar wind is expected to reach Earth on August 30.

5. Geophysical Activity Forecast
The geomagnetic field is expected to be at quiet to minor storm levels on August 31 - September 2. Moderate storm levels are also possible for this period.

   Date      Estimated Ap index      Expected geom. storm
2017.08.31           12                        G1
2017.09.01           22                        G1
2017.09.02           20                        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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