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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2015 Sep 25 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
25 Sep 2015	105	007
26 Sep 2015	103	009
27 Sep 2015	101	010

Bulletin

Eight sunspot groups were reported by Catania today. Two C-class flares were detected during the past 24 hours: a C1.8 flare peaking at 21:46 UT in the Catania sunspot group 39 (NOAA AR 2422) and a C3.2 flare peaking at 23:47 UT in the Catania sunspot group 37 (NOAA AR 2421). (The latter flare was erroneously attributed to the NOAA AR 2418 by NOAA.) We expect flaring activity on the C-level, with a small chance for an M-class flare. The solar wind speed at the Earth is currently around 460 km/s, and the interplanetary magnetic field is around 5-6 nT. We expect quiet to unsettled geomagnetic conditions in the coming hours.

Today's estimated international sunspot number (ISN): 154, based on 15 stations.

Solar indices for 24 Sep 2015

Wolf number Catania	///
10cm solar flux	107
AK Chambon La Forêt	016
AK Wingst	010
Estimated Ap	010
Estimated international sunspot number	095 - Based on 24 stations

Noticeable events summary

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

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