Viewing archive of Wednesday, 17 April 2013

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2013 Apr 17 1234 UTC

SIDC Forecast

Solar flares

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

Geomagnetism

Quiet (A<20 and K<4)

Solar protons

Quiet

	10cm flux	Ap
17 Apr 2013	108	006
18 Apr 2013	107	006
19 Apr 2013	106	009

Bulletin

Six sunspot groups were reported by Catania today. The flaring activity was at the low C-class level, and the strongest flare reported was the long duration C3.5 flare peaking at 21:32 UT on April 16. The flare originated from the Catania sunspot group 43 (NOAA AR 1719) situated at that moment close to the west solar limb. The flare was associated with the coronal dimming. The presence of the coronal dimming gives indication that the flare had an associated CME. However, this cannot be confirmed due to the data gap in SOHO/LASCO and STEREO observations. The flaring activity at the C-class level is probable and the M-class flares are still possible but unlikely. The Earth is inside a slow solar wind with a speed of about 350 km/s. The interplanetary magnetic field magnitude is about 4 nT. The Bz component of the interplanetary magnetic field is fluctuating with the occasional intervals of its negative values (up to -5 nT). The geomagnetic conditions are quiet and expected to remain so.

Today's estimated international sunspot number (ISN): 062, based on 08 stations.

Solar indices for 16 Apr 2013

Wolf number Catania	109
10cm solar flux	113
AK Chambon La Forêt	010
AK Wingst	005
Estimated Ap	004
Estimated international sunspot number	067 - Based on 20 stations

Noticeable events summary

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

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