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Solar activity forecast for the period June 26 - July 02, 2026

Activity level: low to moderate 
X-ray background flux (1.0-8.0 A): in the range B6.0-C2.5
Radio flux (10.7 cm): a fluctuation in the range: 115-165
Events: class C (2-10/day), class M (0-2/period), class X (0-0/period), proton (0-1/period)
Relative sunspot number (Ri): in the range 78-167

Karolina Knesplova
RWC Prague, Astronomical Institute, Solar Dept., Ondrejov, Czech Republic 

Geomagnetic activity forecast for the period June 26 - July 02, 2026

Quiet:   Jun 30 - Jul 01
Unsettled: Jun 26 - 29
Active:  Jun 26 - 27, Jul 02
Minor storm:  possible about  Jun  27, Jul 02
Major storm:  0
Severe storm: 0

Currently, the geomagnetic activity enhances to active level. Today, at the Budkov observatory, the local K-index reach the level 4 during this morning.
Unsettled to active conditions are expected also the two next days.
Since June 30, we expect a partial activity decrease to quiet to unsettled level.
The last day of currently forecasted period, an another active  to to minor storm event is possible again.

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 26 - July 02, 2026

After the last and largest sunspot group in the chain as observed by the Solar Orbiter appeared on the southeastern limb of the solar disk, we can expect another increase in solar activity to a level somewhat higher than expected. At the same time, there are three coronal holes near the central meridian, with additional active regions just ahead of them.

As a result, the solar wind intensified significantly on June 24, triggering a geomagnetic disturbance. The maximum southern (i.e., longitudinal) component of Bz reached -12 nT, whereas this trend appears set to continue through June 27. This will result in highly variable shortwave propagation conditions. Furthermore, propagation will be more affected by the sporadic E layer than in recent days.

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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