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Product: Daily Forecast of Geomagnetic Activity
Issued: 2015 May 13 07:07UTC
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 12.05.2015 at 20:00 UTC was 163 sfu.
The background X-Ray flux is at the class B8 level.
The geomagnetic field was at quiet to unsettled levels on May 12.
No obviously Earth directed CMEs were observed.
The Kp index now is at moderate storm levels with Kp=6.
A G2-class geomagnetic storm is in progress. This storm is the result of the interactions of a high speed stream from coronal hole CH667 and Earth's magnetosphere.

2. Solar Wind Geomagnetic Activity
Solar wind speed from ACE: 590 km/s.
Solar wind speed from STEREO A: --- km/s.
Solar wind speed from STEREO B: --- km/s.
The southward component of Bz is: 3.9 nT north.

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

4. Coronal Holes
A recurrent extension (CH667) of the southern polar coronal hole rotated across the central meridian on May 8-9 and may be associated with a co-rotating interaction region. A recurrent southern hemipshere coronal hole (CH668) will probably rotate into an Earth facing position on May 14-15.

5. Geophysical Activity Forecast
The geomagnetic field is expected to be at active to moderate storm levels on May 13, quiet to unsettled levels on May 14 and quiet levels on May 15.

    Date         Estimated Geomagnetic Ap index
2015.05.13                      39
2015.05.14                      16
2015.05.15                      8

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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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