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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2015 Sep 24 1231 UTC

SIDC Forecast

Brillamenti solari

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

Geomagnetism

Active conditions expected (A>=20 or K=4)

Protoni solari

Quiet

	10cm flux	Ap
24 Sep 2015	100	014
25 Sep 2015	097	014
26 Sep 2015	094	011

Bulletin

Five active regions were reported today by NOAA. The flaring activity is below the C-level today, but seven C-class flares were detected yesterday, the strongest of them being the C3.2 flare peaking at 18:57 UT in the Catania sunspot group 39 (NOAA AR 2422). We expect flaring activity on the C-level, with a small chance for an M-class flare, in particular in the Catania sunspot group 39 (NOAA AR 2422). The Earth is currently inside a slow (around 460 km/s) solar wind flow with average (5-6 nT) interplanetary magnetic field magnitude. The geomagnetic conditions are quiet. Today we expect the arrival of a fast solar wind stream from a small equatorial coronal hole. Active to minor geomagnetic storm conditions may occur.

Today's estimated international sunspot number (ISN): 094, based on 16 stations.

Solar indices for 23 Sep 2015

Wolf number Catania	082
10cm solar flux	///
AK Chambon La Forêt	018
AK Wingst	014
Estimated Ap	012
Estimated international sunspot number	089 - Based on 21 stations

Noticeable events summary

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

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