Hvezdáreň Roztoky

May 28 – June 3, 2021

Solar activity forecast for the period May 28 – June 3, 2021

Issued: 2021 May 27 2100 UTC

Activity level from May 28 to May 31: mostly 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 (0-10/day), class M (0-1/day), class X (0/period), proton (0/period)
Relative sunspot number (Ri): in the range 0-45

Activity level from Jun 1 to Jun 3: 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
e-mail: safor (at) protonmail.ch

Geomagnetic activity forecast for the period May 28 – June 3, 2021

Issued: 2021 May 27 2130 UTC

Quiet to unsettled: May 28 – Jun 3

Jozef Lesko
Roztoky Observatory, Slovak Republic
e-mail: safor (at) protonmail.ch