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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2017 Apr 06 1230 UTC

SIDC Forecast

Brillamenti solari

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

Geomagnetism

Quiet (A<20 and K<4)

Protoni solari

Quiet

	10cm flux	Ap
06 Apr 2017	083	004
07 Apr 2017	081	005
08 Apr 2017	079	005

Bulletin

Solar activity was at low levels during the period. The strongest event was a C1.1 flare peaking at 10:26UT. This flare was produced by decaying NOAA 2645. This region still has magnetic mixing in its trailing portion. The 10.7cm radio flux dropped from 94 sfu on 4 April to 85 sfu on 5 April. No earth-directed coronal mass ejections (CMEs) were observed in available coronagraphic imagery. The greater than 10MeV proton flux was at nominal levels.

C-class flaring is expected, with a small chance on an isolated M-class flare.

Earth environment was under the influence of a moderate speed stream from a negative coronal hole. Solar wind speed gradually increased from 400 km/s at noon to 500 km/s by midnight, and has been steady since. Bz fluctuated between -7 and +4 nT. The interplanetary magnetic field was mostly directed towards the Sun.

The geomagnetic field was at quiet to unsettled levels, with an active episode during the 21-24UT interval. Quiet to unsettled conditions are expected, with a chance on an active episode.

Today's estimated international sunspot number (ISN): 037, based on 18 stations.

Solar indices for 05 Apr 2017

Wolf number Catania	054
10cm solar flux	085
AK Chambon La Forêt	017
AK Wingst	012
Estimated Ap	011
Estimated international sunspot number	052 - Based on 32 stations

Noticeable events summary

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

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