Hvezdáreň Roztoky

September 3 – 9, 2021

Solar activity forecast for the period September 3 – 9, 2021

Issued: 2021 Sep 2 2100 UTC

Activity level from Sep 3 to Sep 6: mostly low
X-ray background flux (1.0-8.0 A): in the range A7.0-B7.0
Radio flux (10.7 cm): a fluctuation in the range 75-100 f.u.
Events: class C (0-10/day), class M (0-1/period), class X (0/period), proton (0/period)
Relative sunspot number (Ri): in the range 11-70

Activity level from Sep 7 to Sep 9: mostly low
X-ray background flux (1.0-8.0 A): in the range A7.0-B7.0
Radio flux (10.7 cm): a fluctuation in the range 75-100 f.u.
Events: class C (0-10/day), class M (0-1/period), class X (0/period), proton (0/period)
Relative sunspot number (Ri): in the range 11-70

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 3 – 9, 2021

Issued: 2021 Sep 2 2130 UTC

Quiet to unsettled: Sep 3 – 5
Quiet to active: Sep 6 – 9

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