Viewing archive of Saturday, 9 February 2013

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2013 Feb 09 1328 UTC

SIDC Forecast

Solar flares

Quiet conditions (<50% probability of C-class flares)

Geomagnetism

Quiet (A<20 and K<4)

Solar protons

Quiet

	10cm flux	Ap
09 Feb 2013	104	007
10 Feb 2013	103	010
11 Feb 2013	102	005

Bulletin

The only C-class flare reported during last 24 hours was the long duration C2.4 flare peaking at 06:40 UT. The flare was associated with eruption of a filament channel between the Catania sunspot groups 79 (NOAA AR 1667), and 80 (NOAA AR 1670), coronal dimming and post-eruption arcade. Occasional C-class flares are possible but not very probable. The associated CME was directed northward and appeared first time in the SOHO/LASCO C2 field of view at 06:48 UT. From the currently available data it seems that the width of the CME was about 100 degrees. Due to the position of the CME source region close to the central meridian, it is possible that this CME will arrive at the Earth. More exact prediction will be available with the arrival of the new data. The solar wind speed has reached maximum value of about 480 km/s late on February 8. The speed of the solar wind is decreasing and is now around 400 km/s. The interplanetary magnetic field magnitude is about 5 nT. The halo CME from February 6 (associated with the C8.7 flare) might still arrive today. The arrival of a CME-driven shock wave associated with the partial-halo CME on February 6 (related with the C1.3 flare) can be expected on early February 10. We expect quiet to possibly unsettled geomagnetic conditions.

Today's estimated international sunspot number (ISN): 035, based on 07 stations.

Solar indices for 8 Feb 2013

Wolf number Catania	059
10cm solar flux	104
AK Chambon La Forêt	012
AK Wingst	008
Estimated Ap	008
Estimated international sunspot number	038 - Based on 19 stations

Noticeable events summary

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

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