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

Activity level: mostly very low to low
X-ray background flux (1.0-8.0 A): in the range A9.5-B4.0
Radio flux (10.7 cm): a fluctuation in the range 80-88
Events: class C (2-8/period), class M (0-1/period), class X (0/period), proton (0/period)
Relative sunspot number (Ri): in the range 22-80

Martina Pavelkova
RWC Prague, Astronomical Institute, Solar Dept., Ondrejov, Czech Republic
e-mail: sunwatch(at)asu.cas.cz

Geomagnetic activity forecast for the period July 23 - July 29, 2021

Quiet: Jul 25 - 28
Unsettled: Jul 28 - 29
Active: Jul 23 - 24, 29
Minor storm: possible Jul 23
Major storm: 0
Severe storm: 0

Geomagnetic activity summary:
We expect geomagnetic activity enhancement during the coming 48 hours. 
Then, since Sunday, July 25, we expect quiet to unsettled conditions 
More unsettled conditions with possibly isolated active event is also 
possible at the end of currently forecasted period, i.e. about July 29.

Tomas Bayer
RWC Prague
Institute of Geophysics of the ASCR, Prague
Department of Geomagnetism
Budkov observatory (BDV)

Geomagnetic activity forecast for the period July 23 - August 19, 2021

Geomagnetic field will be
quiet on: July 25, 30, August 7, 12 - 13
quiet to unsettled on: July 24, 28 - 29, 31, August 9, 14
quiet to active on: July 23, 26, August 1, 3 - 6, 11, 15 - 17, 19
unsettled to active: July 27, August 2, 8, 10, 18
active to disturbed: -

- Parenthesis means lower probability of activity enhancement.
- Next Thursday, I will not compile a forecast of the Earth's magnetic
field activity, because I will be walking on the highest mountains of my
country - the Krkonoše Mountains. Without the conveniences of civilization
as computer or the Internet. But I will have a good friends, camera and
binoculars with me!

F. K. Janda, OK1HH
(from Czech Propagation Interested Group
compiling this geomagnetic activity weekly forecasts since January 1978).
Emails: ok1hh(at)crk.cz, ok1hh(at)rsys.cz

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