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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2018 Sep 09 1230 UTC

SIDC Forecast

Brillamenti solari

Quiet conditions (<50% probability of C-class flares)

Geomagnetism

Minor storm expected (A>=30 or K=5)

Protoni solari

Quiet

	10cm flux	Ap
09 Sep 2018	069	008
10 Sep 2018	069	013
11 Sep 2018	069	034

Bulletin

Solar activity was at very low levels. Small and inactive sunspot region NOAA 2721 is still present on the solar disk. No earth-directed coronal mass ejections (CMEs) were observed in the available coronagraphic imagery. The greater than 10 MeV proton flux was at nominal levels. A trans-equatorial positive polarity coronal hole (CH) has finished its transit over the Central Meridian.

Solar activity is expected to remain at very low levels.

Solar wind speed varied between 360 and 430 km/s, ending the period near 370 km/s (DSCOVR). Bz varied mostly between -4 and +3 nT, ending the period at +6 nT. The direction of the interplanetary magnetic field was variable.

Quiet to unsettled geomagnetic conditions were observed. Mostly quiet geomagnetic conditions are expected with a chance on an unsettled episode until the arrival of the co-rotating interaction region (CIR) and wind stream from the positive polarity CH, late on 10 or on 11 September. This may result in minor storming conditions.

Today's estimated international sunspot number (ISN): 015, based on 21 stations.

Solar indices for 08 Sep 2018

Wolf number Catania	///
10cm solar flux	069
AK Chambon La Forêt	009
AK Wingst	005
Estimated Ap	005
Estimated international sunspot number	016 - Based on 23 stations

Noticeable events summary

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

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