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Solar activity forecast for the period April 11 - April 17, 2025

Activity level: low to moderate
X-ray background flux (1.0-8.0 A): in the range B9.5-C5.0
Radio flux (10.7 cm): a fluctuation in the range 100-195
Events: class C (3-15/day), class M (1-8/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 11 - April 17, 2025

Quiet: Apr 12, 14
Unsettled: Apr 11 - 13, 15
Active: Apr 16 - 17
Minor storm: Apr 16 - 17
Major storm: 0
Severe storm: 0

Because of the current (although small) coronal hole and dense protuberances at the eastern border of solar disk, we expect an active to disturbed event especially in the second half of currently forecasted period. It is most probable about Wednesday, April 16.

Till this event, we expect at most the current geomagnetic activity at unsettled level. It can be intermissed by some quiet days about the coming weekend.

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 11 - April 17, 2025

Not issued

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