Weekly forecast

Solar activity forecast for the period April 18 - April 24, 2025

Activity level: low to moderate
X-ray background flux (1.0-8.0 A): in the range B8.0-C5.0
Radio flux (10.7 cm): a fluctuation in the range 115-195
Events: class C (3-15/day), class M (1-6/period), class X (0-1/period), proton (0-1/period)
Relative sunspot number (Ri): in the range 60-190

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

Geomagnetic activity forecast for the period April 18 - April 24, 2025

Quiet: Apr 20 - 21
Unsettled: Apr 18 - 19, 22 - 24
Active: Apr 23 - 24
Minor storm: Apr 23 - 24
Major storm: possible about Apr 23
Severe storm: 0

At the Budkov observatory, the local K-index reached twice the level 6.

Now, we expect geomagnetic activity decrease to unsettled level, generally, although an active evnt is still possible within coming two days.
Since Sunday, April 20, the quietest part of the forecasted period is expected.
Since Tuesday, April 22, we expect unsettled to active conditions return. An another storming event is possible at the end of currently forecasted period, April 23 - 24.

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 April 18 - April 24, 2025

Not issued

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