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Product: Daily Forecast of Geomagnetic Activity
Issued: 2019 August 31 06:21UTC
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 30.08.2019 at 20:00 UTC was 67 sfu.
The background X-Ray flux is at the class A6 level.
The geomagnetic field was at quiet to unsettled levels on August 30.
No obviously Earth directed CMEs were observed in available LASCO imagery. 
The Kp index now is at minor storm (G1) levels with Kp=5.

2. Solar Wind Geomagnetic Activity
Solar Wind speed from ACE: 675 km/s.
Solar Wind speed from STEREO A: 340 km/s.
Solar Wind speed from STEREO B: --- km/s.
The southward component Bz is: 4 nT south.

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

4. Coronal Holes
An equatorial coronal hole (CH935) of the visible solar disk was in Earth facing position on August 27-29. A high speed stream of solar wind finally arrived some hours earlier than our prediction due to the high solar wind speed.

5. Geophysical Activity Forecast
The geomagnetic field is expected to be at unsettled to minor storm levels, with a chance for moderate storm levels, on August 31-September 2 due to CH935 effects.

   Date      Estimated Ap index      Expected geom. storm
2019.08.31           32                        G1 - G2
2019.09.01           25                        G1 - G2
2019.09.02           14                        -

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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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