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Product: Daily Forecast of Geomagnetic Activity
Issued: 2019 May 05 05:06UTC
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 04.05.2019 at 20:00 UTC was 72 sfu.
The background X-Ray flux is at the class A9 level.
The geomagnetic field was at quiet to unsettled levels on May 4.
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: 450 km/s.
Solar Wind speed from STEREO A: 350 km/s.
Solar Wind speed from STEREO B: --- km/s.
The southward component Bz is: 1 nT south.

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

4. Coronal Holes
A new small equatorial coronal hole (CH917) was in Earth facing position on May 3-4. A high speed stream of solar wind is expected to reach Earth on the first half of May 7.

5. Geophysical Activity Forecast
The geomagnetic field is expected to be at almost quiet levels on May 5, at quiet levels on May 6 and at quiet to active levels on May 7 due to CH917 effects.

   Date      Estimated Ap index      Expected geom. storm
2019.05.05           04                        -
2019.05.06           03                        -
2019.05.07           08                        -

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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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