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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2013 Aug 14 1213 UTC

SIDC Forecast

Brillamenti solari

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

Geomagnetism

Quiet (A<20 and K<4)

Protoni solari

Quiet

	10cm flux	Ap
14 Aug 2013	131	017
15 Aug 2013	135	012
16 Aug 2013	138	007

Bulletin

We expect solar activity to stay at eruptive levels with risks of C class flares essentially from NOAA ARs 1817 and 1818. A small eruption occurred to the west of AR 1817 on Aug. 13, around 1230 UT. It was associated with a CME which appeared to be non geoeffective. Geomagnetic activity is expected to be mostly unsettled for the next 24 hours, as the Earth entered a fast wind stream linked to a coronal hole in geoeffective position. Current observations by the ACE spacecraft show a solar wind speed around 450 km/s and Bz fluctuations diminishing compared to the last 20 hours.

Today's estimated international sunspot number (ISN): 074, based on 15 stations.

Solar indices for 13 Aug 2013

Wolf number Catania	///
10cm solar flux	122
AK Chambon La Forêt	020
AK Wingst	014
Estimated Ap	013
Estimated international sunspot number	077 - Based on 16 stations

Noticeable events summary

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

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