Hvezdáreň Roztoky

December 17 – 23, 2021

Solar activity forecast for the period December 17 – 23, 2021

Issued: 2021 Dec 16 2100 UTC

Activity level from Dec 17 to Dec 20: low to moderate
X-ray background flux (1.0-8.0 A): in the range B2.0-C2.0
Radio flux (10.7 cm): a fluctuation in the range 110-140 f.u.
Events: class C (1-12/day), class M (0-2/day), class X (0-1/period), proton (0/period)
Relative sunspot number (Ri): in the range 50-110

Activity level from Dec 21 to Dec 23: low to moderate
X-ray background flux (1.0-8.0 A): in the range B2.0-C2.0
Radio flux (10.7 cm): a fluctuation in the range 100-130 f.u.
Events: class C (0-10/day), class M (0-1/day), class X (0-1/period), proton (0/period)
Relative sunspot number (Ri): in the range 40-100

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

Geomagnetic activity forecast for the period December 17 – 23, 2021

Issued: 2021 Dec 16 2130 UTC

Quiet to unsettled: Dec 17 – 20
Quiet to active: Dec 21 – 23

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