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Solar activity forecast for the period September 18 - September 24, 2026

Activity level: low
X-ray background flux (1.0-8.0 A): in the range B2.0-B6.5
Radio flux (10.7 cm): a fluctuation in the range: 85-130
Events: class C (0-4/day), class M (0-1/period), class X (0/period), proton (0/period)
Relative sunspot number (Ri): in the range 0-74

Vlastislav Feik
RWC Prague, Astronomical Institute, Solar Dept., Ondrejov, Czech Republic 

Geomagnetic activity forecast for the period September 18 - September 24, 2026

Quiet:   Sep 19 - 22, 16 - 17
Unsettled: Sep 18, 22 - 23
Active:  Sep 23 - 24
Minor storm: possible about Sep 24
Major storm:  0
Severe storm: 0

We expect an ative event within the nearest hours.
Then, since Friday, September 18, we expect at most unsettled conditions.
Since Saturday, September 19, we expect quiet to unsettled condtions generally.
At the end of currently forecasted period, an another active episode with possible storm event is possible. 

Tomas Bayer
RWC Prague
Institute of Geophysics of the ASCR, Prague
Department of Geomagnetism
Budkov observatory (BDV)

Weekly Commentary on the Sun, the Magnetosphere, and the Earth's Ionosphere September 18 - September 24, 2026

Weekly Commentary on the Sun, the Magnetosphere, and the Earth's Ionosphere, September 17, 2026

On the solar disc, we observe not only a small number of sunspot groups. These groups are also relatively small and their magnetic structure is fairly simple. As a result, eruptive activity – including coronal mass ejections – is low. Although these phenomena do occur from time to time, they have had no impact on Earth recently. It is mainly the streams of high-speed solar wind that, upon entering the Earth’s atmosphere, cause an increase in geomagnetic activity and can therefore be predicted more accurately.

An increase in solar activity is not expected in the foreseeable future. The current slightly higher geomagnetic activity should be followed by a period of calm. The next period of higher geomagnetic activity is not expected until around the equinox; during that time, conditions for shortwave propagation through the ionosphere should be above average, although—due to low solar activity—this will not apply to the shortest shortwave bands.

F. K. Janda, A.R.S. OK1HH
http://ok1hh.nagano.cz/
Emails: ok1hh(at)crk.cz, ok1hh(at)rsys.cz
Pmail: OK1HH(at)OK0NAG.#BOH.CZE.EU

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