September 12 – 18, 2025

Solar activity forecast for the period September 12 – 18, 2025

Issued: 2025 Sep 11 2100 UTC

Activity level from Sep 12 to Sep 15: mostly low to moderate
X-ray background flux (1.0-8.0 A): in the range B3.0-C2.0
Radio flux (10.7 cm): a fluctuation in the range 110-180 f.u.
Events: class C: 1-20/day, class M: 0-4/day, class X: 0-1/period, proton: 0-1/period
Relative sunspot number (Ri): in the range 30-175

Activity level from Sep 16 to Sep 18: mostly low to moderate
X-ray background flux (1.0-8.0 A): in the range B3.0-C2.0
Radio flux (10.7 cm): a fluctuation in the range 110-180 f.u.
Events: class C: 1-20/day, class M: 0-4/day, class X: 0-1/period, proton: 0-1/period
Relative sunspot number (Ri): in the range 30-175

Jozef Lesko
Roztoky Observatory, Slovak Republic
https://roztoky.space/category/predpovede/
e-mail: safor (at) protonmail.ch

Geomagnetic activity forecast for the period September 12 – 18, 2025

Issued: 2025 Sep 11 2130 UTC

Quiet to active: Sep 12 – 18

Jozef Lesko
Roztoky Observatory, Slovak Republic
https://roztoky.space/category/predpovede/
e-mail: safor (at) protonmail.ch