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Daily bulletin on solar and geomagnetic activity from the SIDC

Vydáno: 2017 Jun 04 1230 UTC

SIDC Forecast

Sluneční erupce

C-class flares expected, (probability >=50%)

Geomagnetism

Quiet (A<20 and K<4)

Sluneční protony

Quiet

	10cm flux	Ap
04 Jun 2017	079	006
05 Jun 2017	080	007
06 Jun 2017	080	007

Bulletin

Catania group 29 (NOAA active region 2661) produced some further C flaring: two C2.5 magnitude flares peaking at 14:56UT and 19:34UT. Dispersion of the magnetic field is observed in the leading part of the region, but there remains mixed polarity field in the middle and trailing portions of the region. Further C flaring should be anticipated with also a slight chance for an isolated M flare. No Earth directed CMEs have been observed in available coronagraph images. Proton flux levels are at background values and are expected to remain so.

Solar wind was subject to further enhancement due to coronal hole influence with Solar wind speed reaching a maximum of close to 500 km/s, meanwhile recovering to around 430 km/s. After an initial sustained period of strongly negative Bz (-13nT) the magnetic field magnitude recovered to nominal values of around 5nT, with a variabale Bz component. A further recovery towards nominal Solar wind conditions is expected over the next days. Geomagnetic conditions have been active (both NOAA Kp and local K Dourbes 4) on June 3 afternoon associated to the sustained negative values of Bz, but remained quiet afterwards. Quiet to unsettled geomagnetic conditions are expected over the next days.

Today's estimated international sunspot number (ISN): 027, based on 22 stations.

Solar indices for 03 Jun 2017

Wolf number Catania	///
10cm solar flux	078
AK Chambon La Forêt	017
AK Wingst	011
Estimated Ap	012
Estimated international sunspot number	026 - Based on 25 stations

Noticeable events summary

Provided by the Solar Influences Data analysis Center© - SIDC - Processed by SpaceWeatherLive

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