Hvezdáreň Roztoky

June 4 – 10, 2021

Solar activity forecast for the period June 4 – 10, 2021

Issued: 2021 Jun 3 2100 UTC

Activity level from Jun 4 to Jun 7: very low to low
X-ray background flux (1.0-8.0 A): in the range A3.0-B3.0
Radio flux (10.7 cm): a fluctuation in the range 70-90 f.u.
Events: class C (0-5/day), class M (0/period), class X (0/period), proton (0/period)
Relative sunspot number (Ri): in the range 0-40

Activity level from Jun 8 to Jun 10: 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 (0-5/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
web: osveta.sk/n/11283/astronomia.html
e-mail: safor (at) protonmail.ch

Geomagnetic activity forecast for the period June 4 – 10, 2021

Issued: 2021 Jun 3 2130 UTC

Quiet to unsettled: Jun 4 – 10

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