October 22 – 28, 2021

Solar activity forecast for the period October 22 – 28, 2021

Issued: 2021 Oct 21 2100 UTC

Activity level from Oct 22 to Oct 25: very low to low
X-ray background flux (1.0-8.0 A): in the range A8.0-B6.0
Radio flux (10.7 cm): a fluctuation in the range 75-100 f.u.
Events: class C (0-10/day), class M (0-1/day), class X (0/period), proton (0/period)
Relative sunspot number (Ri): in the range 11-60

Activity level from Oct 26 to Oct 28: very low to low
X-ray background flux (1.0-8.0 A): in the range A8.0-B6.0
Radio flux (10.7 cm): a fluctuation in the range 75-100 f.u.
Events: class C (0-10/day), class M (0-1/day), class X (0/period), proton (0/period)
Relative sunspot number (Ri): in the range 11-60

Jozef Lesko
Roztoky Observatory, Slovak Republic
www.osveta.sk/n/11283/astronomia.html
e-mail: safor (at) protonmail.ch

Geomagnetic activity forecast for the period October 22 – 28, 2021

Issued: 2021 Oct 21 2130 UTC

Quiet to unsettled: Oct 22 – 28

Jozef Lesko
Roztoky Observatory, Slovak Republic
www.osveta.sk/n/11283/astronomia.html
e-mail: safor (at) protonmail.ch