Viewing archive of Wednesday, 9 April 2014

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2014 Apr 09 1222 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
09 Apr 2014	130	004
10 Apr 2014	133	004
11 Apr 2014	135	005

Bulletin

The Sun produced only one single C-class flare, originating from Catania sunspot region 13 (NOAA AR 2031). More C-class flares are expected during the next 48 hours, from Catania sunspot regions 8, 13 and 18 (NOAA ARs 2026, 2031 and 2032 respectively). There is also a slight chance for an M-class flare. A full halo CME was visible in coronagraphic imagery. It was first visible in LASCO C2 images at 23:48 UT, April 8 as a partial halo (angular width of around 200 degrees), and evolved further to a full halo CME. First measurements in STEREO B/COR2 were at 00:25 UT, April 9. It concerns a backsided CME and therefore we do not expect the CME to be geoeffective. Two recurrent coronal holes (centred near S45E05 and N25E05) have reached the central meridian and are expected to arrive near Earth during the second half of April 12. No Earth-directed CMEs were observed. Solar wind speed measured by ACE fluctuated between 380 and 500 km/s. The magnitude of the interplanetary magnetic field reached a maximum of 6 nT, with a mainly positive Bz component. Current magnetic conditions are quiet and are expected to remain so for the next 48 hours. The arrival of the CH high speed stream might result in active conditions from April 12 on.

Today's estimated international sunspot number (ISN): 069, based on 23 stations.

Solar indices for 08 Apr 2014

Wolf number Catania	144
10cm solar flux	132
AK Chambon La Forêt	007
AK Wingst	004
Estimated Ap	004
Estimated international sunspot number	083 - Based on 30 stations

Noticeable events summary

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

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