Weekly forecast

Forecast issued date:

Solar activity forecast for the period October 23 - October 29, 2026

Activity level: low
X-ray background flux (1.0-8.0 A): in the range B7.0-C2.0
Radio flux (10.7 cm): a fluctuation in the range: 101-132
Events: class C (0-6/day), class M (0-2/period), class X (0/period), proton (0/period)
Relative sunspot number (Ri): in the range 21-75

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

Geomagnetic activity forecast for the period October 23 - October 29, 2026

Quiet: Oct 25 - 29
Unsettled: Oct 23 - 25
Active: 24 - 25
Minor storm: possible about Oct 24
Major storm: 0
Severe storm: 0

Last days, geomagnetic activity has reached an active level, the local K-index at the Budkov observatory reached level 4.
Next days, we expect the activity at unsettled to active level till Sunday, October 25. About Saturday, October 24, a higher active event with possible but unlike magnetic storm can occur.
Since Sunady, October 25, we expect geomagnetic activity decrease to quiet to unsettled level and remain this to the end of the currently forecasted period.
Another geomagnetic activity increase with possible storm event is expected about October 30.

Tomas Bayer
RWC Prague, Institute of Geophysics CAS
Budkov observatory (BDV)

Weekly Commentary on the Sun, the Magnetosphere, and the Earth's Ionosphere October 23 - October 29, 2026

Weekly Commentary on the Sun, the Magnetosphere, and the Earth's Ionosphere, October 22, 2026

Solar activity is gradually declining in the second half of October, as expected. The decline will continue into early November, with Class C solar flares still occurring infrequently. Class M flares may continue to occur on rare occasions.

The next increase in solar activity is not expected until the second half of November. In the meantime, there will continue to be isolated and generally brief spikes in geomagnetic activity, which will be difficult to predict with precision.

http://ok1hh.nagano.cz/
Emails: ok1hh(at)crk.cz, ok1hh(at)rsys.cz
Pmail: OK1HH(at)OK0NAG.#BOH.CZE.EU

Receive Weekly Forecasts Bulletin

To receive Weekly Forecasts Bulletin via email, sign up for: sunwatch "at-sign" asu.cas.cz