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Product: Daily Forecast of Geomagnetic Activity
Issued: 2017 March 27 06:38UTC
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 26.03.2017 at 20:00 UTC was 77 sfu.
The background X-Ray flux is at the class B1 level.
The geomagnetic field was at very quiet levels on March 26.
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: 490 km/s.
Solar Wind speed from STEREO A: 390 km/s.
Solar Wind speed from STEREO B: --- km/s.
The southward component Bz is: 2 nT north.

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

4. Coronal Holes
An equatorial extension of the southern polar coronal hole was in Earth facing position on March 24-25. A high speed stream from this coronal hole (CH798) reached Earth on the first hours of March 27 as it was predicted.

5. Geophysical Activity Forecast
The geomagnetic field is expected to be at quiet to minor storm levels on March 27 and at unsettled to moderate storm levels on March 28. Quiet to active levels are expected on March 29.

Date Estimated Ap index Expected geom. storm
2017.03.27 32 G1 - G2
2017.03.28 34 G1 - G2
2017.03.29 19 -

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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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