Viewing archive of Monday, 8 April 2013

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2013 Apr 08 1134 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
08 Apr 2013	141	004
09 Apr 2013	144	005
10 Apr 2013	145	003

Bulletin

Three out of nine active regions reported by NOAA today have beta-gamma configuration of the photospheric magnetic field (NOAA ARs 1713, 1718, and 1719). So, despite no C-class flares today, we expect flaring activity on the C-level, with an M-class flare possible but not very likely. An eruption in the NOAA AR 1714 (Catania sunspot group 34) was detected around 02:00 UT on April 8, accompanied by a local soft X-ray flux peak at 01:44 UT at C1.1 level (no flare was reported). Coronal dimmings and a post-eruption arcade observed by SDO/AIA indicate the eruption of a CME. However, SOHO/LASCO did not detect any CME in association with this event, and STEREO coronagraphs have a data gap. Due to presumed weakness of the event (below the detectability threshold of LASCO), any geomagnetic consequences are unlikely. The Earth is currently inside a slow (around 350 km/s) solar wind flow with weak to average (3-4 nT) interplanetary magnetic field magnitude. We expect quiet geomagnetic conditions.

Today's estimated international sunspot number (ISN): 090, based on 09 stations.

Solar indices for 7 Apr 2013

Wolf number Catania	///
10cm solar flux	138
AK Chambon La Forêt	007
AK Wingst	005
Estimated Ap	005
Estimated international sunspot number	082 - Based on 21 stations

Noticeable events summary

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

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