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Product: Daily Forecast of Geomagnetic Activity
Issued: 2018 June 18 05:20UTC
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 17.06.2018 at 20:00 UTC was 71 sfu.
The background X-Ray flux is at the class A4 level.
The geomagnetic field was at very quiet levels on June 16.
No obviously Earth directed CMEs were observed in available LASCO imagery.
The Kp index now is at minor storm levels with Kp=5.

2. Solar Wind Geomagnetic Activity
Solar Wind speed from ACE: 455 km/s.
Solar Wind speed from STEREO A: 380 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 new coronal hole (CH869) in the northern hemisphere of the visible solar disk will be in Earth facing position on June 14-16. A high speed stream of solar wind finally reached Earth on the last hours of June 17. A minor storm G1 is in progress.

5. Geophysical Activity Forecast
The geomagnetic field is expected to be at unsettled to minor storm levels on June 18 and at quiet to unsettled levels on June 19-20 due to CH869.

Date Estimated Ap index Expected geom. storm
2018.06.18 12 G1
2018.06.19 08 -
2018.06.20 06 -

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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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