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Product: Daily Forecast of Geomagnetic Activity
Issued: 2018 August 20 05:43UTC
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 19.08.2018 at 20:00 UTC was 67 sfu.
The background X-Ray flux is at the class A2 level.
The geomagnetic field was at almost quiet levels on August 19.
No obviously Earth directed CMEs were observed in available LASCO imagery.
The Kp index now is at active levels with Kp=4.

2. Solar Wind Geomagnetic Activity
Solar Wind speed from ACE: 610 km/s.
Solar Wind speed from STEREO A: 440 km/s.
Solar Wind speed from STEREO B: --- km/s.
The southward component Bz is: 3 nT north.

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

4. Coronal Holes
A coronal hole (CH881) was in Earth facing position on August 16-19. A high speed stream of solar wind finally reached Earth on the first half of August 20.

5. Geophysical Activity Forecast
The geomagnetic field is expected to be at unsettled to active levels, with a chance for minor storm intervals, on August 20-22 due to CH881 effects.

   Date      Estimated Ap index      Expected geom. storm
2018.08.20           21                        -
2018.08.21           19                        -
2018.08.22           17                        -

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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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