Weekly forecast

Solar activity forecast for the period July 31 - August 06, 2026

Activity level: low to moderate 
X-ray background flux (1.0-8.0 A): in the range B5.5-C2.2
Radio flux (10.7 cm): a fluctuation in the range: 113-176
Events: class C (2-10/day), class M (0-3/period), class X (0-1/period), proton (0-1/period)
Relative sunspot number (Ri): in the range 99-165

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

Geomagnetic activity forecast for the period July 31 - July 30, 2026

Quiet:   Jul 25, Aug 2 - 3, 6
Unsettled: Jul 31, Aug 01, 04 - 05
Active:  Jul 31, Aug 04 - 05
Minor storm:  possible Jul 31, unlikely about Jul 04
Major storm:  0
Severe storm: 0

We expect geomagnetic activity increase during the coming night and tomorrow.
At Friday, July 31,  we expect at most unsettled to active conditions with possible isolated minor storm event.
An another active episode is possible about Tuesday, August 4.
Between these events, we expect quiet to unsettled conditions generally.

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 July 31 - August 06, 2026

Weekly Commentary on the Sun, the Magnetosphere, and the Earth's Ionosphere, July 30, 2026

During the last third of July, solar activity initially rose, while remained at a higher level until the end of the month. Although solar flares occasionally reached moderate intensity, while were exceptionally accompanied by coronal mass ejections, the Earth was not affected by them (though this could still happen by the end of July or early August, partly because there is a coronal hole in the southwestern part of the disk). There is only one active region on the far side of the Sun. Therefore, as the nine regions currently being observed fade, overall activity will decline shortly after the beginning of August.

Shorter periods of increased geomagnetic activity may still occur in late July and at the beginning and end of the first third of August. Following the expected decline in solar activity, these will be followed at irregular intervals by shorter periods of deteriorated ionospheric conditions for shortwave propagation.

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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