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Product: Daily Forecast of Geomagnetic Activity
Issued: 2017 July 28 06:12UTC
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 27.07.2017 at 20:00 UTC was 68 sfu.
The background X-Ray flux is at the class A4 level.
The geomagnetic field was at quiet to unsettled levels on July 27.
No obviously Earth directed CMEs were observed in available LASCO imagery.
The Kp index now is at almost quiet levels with Kp=2.

2. Solar Wind Geomagnetic Activity
Solar Wind speed from ACE: 420 km/s.
Solar Wind speed from STEREO A: 450 km/s.
Solar Wind speed from STEREO B: --- km/s.
The southward component Bz is: 1 nT north.

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

4. Coronal Holes
A new southern coronal hole (CH817), close to the equator of the visible solar disk, was in Earth facing position on July 27-28. A high speed stream of solar wind is expected to reach Earth on the second half of July 30.

5. Geophysical Activity Forecast
The geomagnetic field is expected to be at quiet levels on July 28-29 and at quiet to unsettled levels on July 30.

   Date      Estimated Ap index      Expected geom. storm
2017.07.28           04                        -
2017.07.29           03                        -
2017.07.30           09                        -

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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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