Hvezdáreň Roztoky

September 24 – 30, 2021

Solar activity forecast for the period September 24 – 30, 2021

Issued: 2021 Sep 23 2100 UTC

Activity level from Sep 24 to Sep 27: mostly low
X-ray background flux (1.0-8.0 A): in the range A7.0-B5.0
Radio flux (10.7 cm): a fluctuation in the range 80-100 f.u.
Events: class C (0-12/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 Sep 28 to Sep 30: mostly low
X-ray background flux (1.0-8.0 A): in the range A6.0-B4.0
Radio flux (10.7 cm): a fluctuation in the range 80-100 f.u.
Events: class C (0-12/day), class M (0-1/day), class X (0/period), proton (0/period)
Relative sunspot number (Ri): in the range 0-60

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 September 24 – 30, 2021

Issued: 2021 Sep 23 2130 UTC

Quiet to unsettled: Sep 28 – 30
Quiet to active: Sep 24 – 27

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