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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2014 Apr 18 1312 UTC

SIDC Forecast

Brillamenti solari

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

Geomagnetism

Quiet (A<20 and K<4)

Protoni solari

Quiet

	10cm flux	Ap
18 Apr 2014	183	008
19 Apr 2014	185	006
20 Apr 2014	187	006

Bulletin

Twelve sunspot groups were reported by NOAA today. NOAA ARs 2035, 2036, and 2037 (Catania numbers 24, 25, and 26 respectively) maintain the beta-gamma configuration of the photospheric magnetic field. Up to very recently, the strongest flare of the past 24 hours was the C4.8 flare peaking at 08:09 UT today in the NOAA AR 2036 (Catania number 25). The CME associated with this flare is narrow and is not expected to arrive at the Earth. The same active region just produced an M7.3 flare peaking at 13:03 UT. The currently available data do not allow us to determine if a CME is associated with this flare. We expect further flaring activity on the C-level, with a good chance for another M-class event. The Earth is currently inside an intermediate-speed solar wind flow (around 440 km/s) with a slightly enhanced (around 6-7 nT) interplanetary magnetic field magnitude. We expect quiet to unsettled geomagnetic conditions (K index below 4), with active conditions (K = 4) possible but unlikely.

Today's estimated international sunspot number (ISN): 134, based on 17 stations.

Solar indices for 17 Apr 2014

Wolf number Catania	///
10cm solar flux	179
AK Chambon La Forêt	013
AK Wingst	012
Estimated Ap	012
Estimated international sunspot number	148 - Based on 25 stations

Noticeable events summary

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

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