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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2013 Jan 23 1216 UTC

SIDC Forecast

Brillamenti solari

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

Geomagnetism

Active conditions expected (A>=20 or K=4)

Protoni solari

Quiet

	10cm flux	Ap
23 Jan 2013	112	003
24 Jan 2013	114	003
25 Jan 2013	116	014

Bulletin

Catania sunspot group 70 (NOAA AR 1660) still has the potential to produce a C-class flare. A B5.4 flare peaking around 03:31 UT in this group was accompanied by coronal dimmings and a post-eruption arcade, but with only a weak and narrow CME (according to STEREO COR2 data) that is not expected to arrive at the Earth. The Earth is currently inside a slow (around 290 km/s) solar wind flow with weak (around 1-2 nT) interplanetary magnetic field magnitude. We expect quiet geomagnetic conditions in the coming hours. On January 25 we expect the arrival of a fast solar wind stream emanating from a low-latitude coronal hole in the southern hemisphere, possibly resulting in active geomagnetic conditions.

Today's estimated international sunspot number (ISN): 042, based on 09 stations.

Solar indices for 22 Jan 2013

Wolf number Catania	062
10cm solar flux	110
AK Chambon La Forêt	005
AK Wingst	000
Estimated Ap	001
Estimated international sunspot number	038 - Based on 16 stations

Noticeable events summary

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

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