Hvezdáreň Roztoky

July 23 – 29, 2021

Solar activity forecast for the period July 23 – 29, 2021

Issued: 2021 Jul 22 2100 UTC

Activity level from Jul 23 to Jul 26: very low to moderate
X-ray background flux (1.0-8.0 A): in the range A6.0-B6.0
Radio flux (10.7 cm): a fluctuation in the range 80-100 f.u.
Events: class C (0-12/day), class M (0-1/day), class X (0/period), proton (0/period)
Relative sunspot number (Ri): in the range 22-75

Activity level from Jul 27 to Jul 29: very low to moderate
X-ray background flux (1.0-8.0 A): in the range A6.0-B6.0
Radio flux (10.7 cm): a fluctuation in the range 80-100 f.u.
Events: class C (0-12/day), class M (0-1/day), class X (0/period), proton (0/period)
Relative sunspot number (Ri): in the range 11-75

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 23 – 29, 2021

Issued: 2021 Jul 22 2130 UTC

Quiet to unsettled: Jul 25 – 29
Quiet to active: Jul 23 – 24

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