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Solar activity forecast for the period June 02 - June 08, 2023

Activity level: mostly moderate 
X-ray background flux (1.0-8.0 A): in the range C1.5 - C3.5 
Radio flux (10.7 cm): a fluctuation in the range 130-170
Events: class C (2-15/day), class M (0-4/day), class X (0-2/period), proton (0-1/period)
Relative sunspot number (Ri): in the range 100-220

Bozena Solarova
RWC Prague, Astronomical Institute, Solar Dept., Ondrejov, Czech Republic

Geomagnetic activity forecast for the period June 02 - June 08, 2023

Quiet: Jun 6 - 7
Unsettled: Jun 3 - 6, 8
Active: Jun 2 - 4, 8
Minor storm: Jun 2 - 3, 8
Major storm: 0
Severe storm: 0

We expect active episode arrival during the coming days. At Friday, June 2, an active episode can be accompanied by a minor storming event. Then, since Saturday, June 3, we expect geomagnetic activity decrease to unsettled to active level.
Since Tuesday, June 6, we expect geomagnetic activity decrease to quiet to unsettled level. The last day, June 8, another active event is possible.

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

Weekly Commentary on the Sun, the Magnetosphere, and the Earth's Ionosphere June 02 - June 08, 2023

Weekly Commentary on the Sun, the Magnetosphere, and the Earth's Ionosphere – June 1, 2023

The sun still surprises us, it has been in the habit for billions of years, but we only observe it for a few hundred years. So we have a right to be surprised by what it is doing and what we can observe with instruments on satellites and powerful solar telescopes on Earth. Including the largest four-metre one on the island of Maui in Hawaii, which can see the very fine structures of sunspot nuclei.

What's more, we're seeing spots on the far side of the Sun that are so big that they affect the vibration of the whole Sun. But we can only see their structure and predict possible flares after they appear on the eastern limb of the solar disk. Which was not at all the case with the current most active AR3315, which did not appear there. It emerged later, thereafter began to grow rapidly.

Conversely, the source of the next big flare was hidden behind the southeastern limb of the solar disk and we only saw the prominence above it.
Meanwhile, the larger groups of sunspots have mostly moved to the western half of the solar disk. A large coronal hole in the southern hemisphere of the Sun now crosses the central meridian. This increases the likelihood of geomagnetic disturbances starting on June 2.

F. K. Janda, A.R.S. OK1HH
http://ok1hh.nagano.cz/
Emails: ok1hh(at)crk.cz, ok1hh(at)rsys.cz
Pmail: OK1HH(at)OK0NAG.#BOH.CZE.EU

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