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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2013 Apr 20 1219 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
20 Apr 2013	100	005
21 Apr 2013	103	006
22 Apr 2013	105	004

Bulletin

The flaring activity during past 24 hours was of the low C-class level and all the C-class flares originated from the newly emerged and fast developing Catania sunspot group 51 (NOAA AR 1726). The flaring activity at the C-class level is probable in particular from the newly emerged Catania sunspot groups 51 and 52 (NOAA AR 1726 and NOAA AR 1727) and Catania sunspot group 46 (NOAA AR 1723). M-class flares are possible but unlikely. The solar wind speed slightly increased and now amounts about 340 km/s. The interplanetary magnetic field magnitude is about 6 nT. The Bz component of the interplanetary magnetic field is fluctuating with the intervals of its negative value (up to - 4 nT). The geomagnetic conditions are quiet and expected to remain so.

Today's estimated international sunspot number (ISN): 063, based on 15 stations.

Solar indices for 19 Apr 2013

Wolf number Catania	092
10cm solar flux	099
AK Chambon La Forêt	///
AK Wingst	002
Estimated Ap	002
Estimated international sunspot number	058 - Based on 25 stations

Noticeable events summary

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

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