Weekly forecast

Solar activity forecast for the period June 19 - June 25, 2026

Activity level: very low to low 
X-ray background flux (1.0-8.0 A): in the range B3.4-B9.8
Radio flux (10.7 cm): a fluctuation in the range: 88-132
Events: class C (1-8/day), class M (0-1/period), class X (0-0/period), proton (0-1/period)
Relative sunspot number (Ri): in the range 34-92

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

Geomagnetic activity forecast for the period June 19 - June 25, 2026

Quiet:   Jun 20 - 22
Unsettled: Jun 19 - 20, 23 - 25
Active:  Jun 24 - 25
Minor storm:  possible about  Jun  24 - 25
Major storm:  0
Severe storm: 0

Next week, at most, we expect quiet to unsettled conditions generally, till Tuesday, June 23.
About Wedesday, June 24, and Thursday, June 25, an active or minor storm event can occur.  

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 June 19 - June 25, 2026

Weekly Commentary on the Sun, the Magnetosphere, and the Earth's Ionosphere, June 18, 2026

The low solar activity observed during the second decade of June will be replaced by significantly higher activity in the third decade, as the active regions observed by the Solar Orbiter on the far side of the Sun will gradually emerge.

Geomagnetic activity will generally be relatively low, and shortwave propagation conditions will be relatively favorable—within the limits of the summer ionosphere in the Earth’s northern hemisphere, that is.

And, as was the case in the second third of June, we can expect a significant influence from the sporadic E layer.

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

Receive Weekly Forecasts Bulletin

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