September 26 – October 2, 2025

Solar activity forecast for the period September 26 – October 2, 2025

Issued: 2025 Sep 25 2100 UTC

Activity level from Sep 26 to Sep 29: low to high
X-ray background flux (1.0-8.0 A): in the range B4.0-C2.0
Radio flux (10.7 cm): a fluctuation in the range 125-200 f.u.
Events: class C: 1-22/day, class M: 0-6/day, class X: 0-1/day, proton: 0-1/period
Relative sunspot number (Ri): in the range 40-200

Activity level from Sep 30 to Oct 2: low to high
X-ray background flux (1.0-8.0 A): in the range B4.0-C2.0
Radio flux (10.7 cm): a fluctuation in the range 125-200 f.u.
Events: class C: 1-22/day, class M: 0-6/day, class X: 0-1/day, proton: 0-1/period
Relative sunspot number (Ri): in the range 40-200

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

Geomagnetic activity forecast for the period September 26 – October 2, 2025

Issued: 2025 Sep 25 2130 UTC

Quiet to active: Sep 26 – Oct 2

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