October 17 – 23, 2025

Solar activity forecast for the period October 17 – 23, 2025

Issued: 2025 Oct 16 2100 UTC

Activity level from Oct 17 to Oct 20: 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 120-185 f.u.
Events: class C: 1-25/day, class M: 0-8/day, class X: 0-1/period, proton: 0-1/period
Relative sunspot number (Ri): in the range 35-180

Activity level from Oct 21 to Oct 23: 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 115-180 f.u.
Events: class C: 1-25/day, class M: 0-6/day, class X: 0-1/period, proton: 0-1/period
Relative sunspot number (Ri): in the range 30-175

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

Geomagnetic activity forecast for the period October 17 – 23, 2025

Issued: 2025 Oct 16 2130 UTC

Quiet to active: Oct 17 – 23

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