September 19 – 25, 2025

Solar activity forecast for the period September 19 – 25, 2025

Issued: 2025 Sep 18 2100 UTC

Activity level from Sep 19 to Sep 22: low to high
X-ray background flux (1.0-8.0 A): in the range B4.0-C3.0
Radio flux (10.7 cm): a fluctuation in the range 125-200 f.u.
Events: class C: 1-25/day, class M: 0-8/day, class X: 0-1/day, proton: 0-1/period
Relative sunspot number (Ri): in the range 40-200

Activity level from Sep 23 to Sep 25: low to high
X-ray background flux (1.0-8.0 A): in the range B5.0-C3.0
Radio flux (10.7 cm): a fluctuation in the range 135-235 f.u.
Events: class C: 1-25/day, class M: 0-8/day, class X: 0-1/day, proton: 0-1/period
Relative sunspot number (Ri): in the range 50-235

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

Geomagnetic activity forecast for the period September 19 – 25, 2025

Issued: 2025 Sep 18 2130 UTC

Quiet to active: Sep 19 – 25

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