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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2014 Apr 16 1218 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
16 Apr 2014	167	005
17 Apr 2014	171	004
18 Apr 2014	174	006

Bulletin

Nine sunspot groups are reported on the Sun today. Four of them have beta-gamma configuration of the photospheric magnetic field: Catania numbers 23, 24, 25, and 26 (NOAA ARs 2034, 2035, 2036, and 2037, respectively). These four groups produced numerous C-class flares during the past 36 hours. None of the flares was associated with a CME. The strongest flare of today is the C5.2 flare peaking at 08:44 UT in the Catania sunspot group 24 (NOAA AR 2035). The solar soft X-ray background flux is currently around the C1 level. We expect further flaring activity on the C-level from these four sunspot groups, with a good chance for an M-class event. The Earth is currently inside a slow (around 320 km/s) solar wind flow with weak to average (3-4 nT) interplanetary magnetic field magnitude. The geomagnetic conditions are quiet and are expected to remain so.

Today's estimated international sunspot number (ISN): 140, based on 18 stations.

Solar indices for 15 Apr 2014

Wolf number Catania	176
10cm solar flux	162
AK Chambon La Forêt	009
AK Wingst	004
Estimated Ap	004
Estimated international sunspot number	107 - Based on 28 stations

Noticeable events summary

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

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