Týdenní předpověď
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Activity level: mostly moderate X-ray background flux (1.0-8.0 A): in the range C1.2 - C3.8 Radio flux (10.7 cm): a fluctuation in the range 145-185 Events: class C (2-15/day), class M (0-5/day), class X (0-2/period), proton (0-1/period) Relative sunspot number (Ri): in the range 110-260 Jana Hrabalova RWC Prague, Astronomical Institute, Solar Dept., Ondrejov, Czech Republic
Quiet: Jun 10, 13 - 14 Unsettled: Jun 9 - 12 Active: Jun 8, 11-12, 15 Minor storm: Jun 8, 15 Major storm: 0 Severe storm: 0 Next week, we expect at most quiet to unsettled conditions with possible active event about Sunday, June 11. Another active one with possible minor storming event is possible the last day of forecasted period, i.e. Thursday, June 15. Other days, we expect quiet to unsettled level. 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 8, 2023 In the last seven days, solar activity has remained at a slightly elevated level, with daily C-class flares and a few M-class flares.This, together with the decrease in geomagnetic activity, has resulted in a gradual increase in the daily maximum of the highest usable frequencies of the F2 ionospheric layer. At the same time, however, the attenuation in the lower ionospheric layers grew, which manifested as earlier morning closures and later evening openings of the longer shortwave bands. Particle clouds from CMEs during solar flares mostly did not reach Earth - with one exception: on 7 June at 2224 UT, the solar wind speed jumped from 340 to 380 km/s. For a short time, the Earth's magnetic field activity increased, usually only to K = 3. The situation was further complicated by the sporadic E layer, whose season is approaching its peak. Inhomogeneities in the sporadic E layer appeared quite frequently and extended reflections were observed in the ionograms. As a consequence, the scattering of electromagnetic waves was as well manifested as attenuation. We are talking about the ionosphere of the northern hemisphere of the Earth. Here we will wait for the improvement when summer ends there - which fortunately will be much earlier than summer ends in the troposphere. 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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