Hvezdáreň Roztoky

June 18 – 24, 2021

Solar activity forecast for the period June 18 – 24, 2021

Issued: 2021 Jun 17 2100 UTC

Activity level from Jun 18 to Jun 21: 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 (0-3/day), class M (0/period), class X (0/period), proton (0/period)
Relative sunspot number (Ri): in the range 11-40

Activity level from Jun 22 to Jun 24: 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 (0-3/day), class M (0/period), class X (0/period), proton (0/period)
Relative sunspot number (Ri): in the range 0-40

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 June 18 – 24, 2021

Issued: 2021 Jun 17 2130 UTC

Quiet: Jun 20 – 24
Quiet to unsettled: Jun 18 – 19

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