Hvezdáreň Roztoky

July 16 – 22, 2021

Solar activity forecast for the period July 16 – 22, 2021

Issued: 2021 Jul 15 2100 UTC

Activity level from Jul 16 to Jul 19: very low to low
X-ray background flux (1.0-8.0 A): in the range A4.0-B4.0
Radio flux (10.7 cm): a fluctuation in the range 70-90 f.u.
Events: class C (0-12/day), class M (0/period), class X (0/period), proton (0/period)
Relative sunspot number (Ri): in the range 11-55

Activity level from Jul 20 to Jul 22: very low to low
X-ray background flux (1.0-8.0 A): in the range A4.0-B4.0
Radio flux (10.7 cm): a fluctuation in the range 70-90 f.u.
Events: class C (0-12/day), class M (0/period), class X (0/period), proton (0/period)
Relative sunspot number (Ri): in the range 11-55

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 July 16 – 22, 2021

Issued: 2021 Jul 15 2130 UTC

Quiet to unsettled: Jul 16 – 22

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