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Product: Daily Forecast of Geomagnetic Activity
Issued: 2017 April 04 05:45UTC
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 03.04.2017 at 20:00 UTC was 108 sfu.
The background X-Ray flux is at the class B8 level.
The geomagnetic field was at quiet levels on April 3.
AR12644 erupted again on April 3 producing a significant M5 solar flare. The result of this eruption was a moderate radio blackout (R2) on April 3 at 14:29 UTC. A CME hurled also into space but it seems that it was not Earth directed.
The Kp index now is at almost quiet levels with Kp=2.

2. Solar Wind Geomagnetic Activity
Solar Wind speed from ACE: 400 km/s.
Solar Wind speed from STEREO A: 350 km/s.
Solar Wind speed from STEREO B: --- km/s.
The southward component Bz is: 8 nT south.

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

4. Coronal Holes
An equatorial coronal hole (CH799) was in Earth facing position on March 30-31.

5. Geophysical Activity Forecast
The geomagnetic field is expected to be at very quiet to almost quiet levels on April 4-6.

   Date      Estimated Ap index      Expected geom. storm
2017.04.04           05                        -
2017.04.05           03                        -
2017.04.06           02                        -

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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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