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Product: Daily Forecast of Geomagnetic Activity
Issued: 2021 July 30 07:56UTC
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 29.07.2021 at 20:00 UTC was 76 sfu.
The background X-Ray flux is at the class A4.3 level.
The geomagnetic field was at quiet to unsettled levels on July 29.
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: 485 km/s.
Solar Wind speed from STEREO A: 350 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
No obvious coronal holes are currently in the visible solar disk.

5. Geophysical Activity Forecast
The geomagnetic field is expected to be at quiet to unsettled levels, with a chance for active intervals, on July 29 - Aug 1 due to combined effects of CH and the arrival of CMEs on Earth.

Date Estimated Ap index Expected geom. storm
2021.07.30 05 -
2021.07.31 08 -
2021.08.01 07 -

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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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