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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2015 Sep 22 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
22 Sep 2015	105	010
23 Sep 2015	106	011
24 Sep 2015	107	019

Bulletin

Five sunspot groups were reported by Catania today. Despite two of them (Catania numbers 31 and 38, NOAA ARs 2415 and 2420 respectively) maintaining the beta-gamma configuration of the photospheric magnetic field, the solar flaring activity was below the C-level in the past 24 hours. We expect flaring activity on the C-level, with a small chance for an M-class flare. An Earth-directed CME is possible in case of eruption of a filament in the south-east quadrant of the solar disk. The solar wind speed at the Earth is currently around 600 km/s, and the interplanetary magnetic field is around 5-6 nT. We expect quiet to unsettled geomagnetic conditions in the coming hours. On September 24, active to minor storm geomagnetic conditions are possible due to the arrival of the fast solar wind flow from the small equatorial coronal hole that reached the solar central meridian yesterday.

Today's estimated international sunspot number (ISN): 077, based on 14 stations.

Solar indices for 21 Sep 2015

Wolf number Catania	///
10cm solar flux	103
AK Chambon La Forêt	014
AK Wingst	009
Estimated Ap	009
Estimated international sunspot number	069 - Based on 25 stations

Noticeable events summary

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

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