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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2014 Apr 25 1246 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
25 Apr 2014	127	006
26 Apr 2014	125	007
27 Apr 2014	125	012

Bulletin

NOAA 2035, already behind the west limb, produced an X1.3 flare peaking at 00:27 UT. No obvious proton flux increase has been observed so far. The event was accompanied by an EIT-wave towards the south (PROBA2/SWAP) and a CME (SOHO/LASCO and STEREO). The CME has a speed of about 500 km/s (CACTUS) and is directed away from Earth. There are currently 5 sunspot regions on disk. They are all quite small and have a quite simple magnetic configuration. An active region, responsible for backside CMEs on 22 and 25 April, is approaching the southeast limb. There's still a chance on a C-class flare, in particular from the regions near the solar limb. There's a decreasing chance on a strong flare from NOAA 2035 as it rotates further onto the Sun's farside. Solar wind speed varied between 400 and 500km/s, and Bz between -5 and +4nT being mostly negative between 21:00 and 01:00UT. Hence, quiet geomagetic conditions were observed, with locally a brief active period. A small equatorial coronal hole passed the central meridian last night. The geomagnetic field may be impacted starting around 27 April. Geomagnetic conditions are expected to be quiet, with locally a brief active interval possible.

Today's estimated international sunspot number (ISN): 046, based on 13 stations.

Solar indices for 24 Apr 2014

Wolf number Catania	///
10cm solar flux	130
AK Chambon La Forêt	020
AK Wingst	017
Estimated Ap	015
Estimated international sunspot number	053 - Based on 22 stations

Noticeable events summary

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

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