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Product: Daily Forecast of Geomagnetic Activity
Issued: 2017 July 24 06:00UTC
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 23.07.2017 at 20:00 UTC was 71 sfu.
The background X-Ray flux is at the class A4 level.
The geomagnetic field was at quiet to active levels on July 23.
No obviously Earth directed CMEs were observed in available LASCO imagery.
The Kp index now is at unsettled levels with Kp=3.

2. Solar Wind Geomagnetic Activity
Solar Wind speed from ACE: 650 km/s.
Solar Wind speed from STEREO A: 460 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
A new coronal hole (CH816) was in Earth facing position on July 21-22. This CH was very small and as a result does not expect to affect Earth.

5. Geophysical Activity Forecast
The geomagnetic field is expected to be at quiet to unsettled levels on July 24 and at quiet levels on July 25-26.

Date Estimated Ap index Expected geom. storm
2017.07.24 05 -
2017.07.25 04 -
2017.07.26 03 -

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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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