Space Weather Report

Athens Cosmic Ray Station
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Product: Daily Forecast of Geomagnetic Activity
Issued: 2021 September 22 06:13UTC
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 21.09.2021 at 20:00 UTC was 85 sfu.
The background X-Ray flux is at the class B1.1 level.
The geomagnetic field was at very quiet to unsettled levels on September 21.
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: 370 km/s.
Solar Wind speed from STEREO A: 410 km/s.
Solar Wind speed from STEREO B: --- km/s.
The southward component Bz is: 6 nT south.

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

4. Coronal Holes
A coronal hole (CH1031) on the northern hemisphere of the visible solar disk was in Earth facing position on Sep. 18. A new coronal hole (CH1032) on the southern hemisphere of the visible solar disk was in Earth facing position on Sep. 19-21.

5. Geophysical Activity Forecast
The geomagnetic field is expected to be at quiet to active levels on Sep 22-24 due to CH effects.

Date Estimated Ap index Expected geom. storm
2021.09.22 11 -
2021.09.23 10 -
2021.09.24 12 -

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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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