Hvezdáreň Roztoky

August 20 – 26, 2021

Solar activity forecast for the period August 20 – 26, 2021

Issued: 2021 Aug 19 2100 UTC

Activity level from Aug 20 to Aug 23: very low to low
X-ray background flux (1.0-8.0 A): in the range A2.0-B2.0
Radio flux (10.7 cm): a fluctuation in the range 70-90 f.u.
Events: class C (0-6/day), class M (0/period), class X (0/period), proton (0/period)
Relative sunspot number (Ri): in the range 0-45

Activity level from Aug 24 to Aug 26: very low to low
X-ray background flux (1.0-8.0 A): in the range A2.0-B2.0
Radio flux (10.7 cm): a fluctuation in the range 70-90 f.u.
Events: class C (0-6/day), class M (0/period), class X (0/period), proton (0/period)
Relative sunspot number (Ri): in the range 0-45

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 August 20 – 26, 2021

Issued: 2021 Aug 19 2130 UTC

Quiet to unsettled: Aug 20 – 22
Quiet to active: Aug 23 – 26

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