Viewing archive of Wednesday, 4 December 2013

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2013 Dec 04 1257 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
04 Dec 2013	136	008
05 Dec 2013	140	007
06 Dec 2013	140	007

Bulletin

Two C-class flares occurred this morning. A C6.8 flare was observed at 00:56 UT on the east limb near the location where AR 1895 and 1897 are expected to return. AR 1897 produced M-class flares during its previous rotation. A C4.7 flare occurred in AR 1907 on the west limb, peaking at 04:58 UT. This flare was associated with a CME observed in SOHO/LASCO and STEREO-A/COR2 around 06:00 UT after a data gap. This CME is not earth-directed. Geomagnetic conditions are currently at quiet levels (KDourbes = 2). We expect possible unsettled conditions on December 7 due to the arrival of a fast wind stream originating from a coronal hole that passed the central meridian today.

Today's estimated international sunspot number (ISN): 086, based on 08 stations.

Solar indices for 03 Dec 2013

Wolf number Catania	///
10cm solar flux	136
AK Chambon La Forêt	016
AK Wingst	012
Estimated Ap	010
Estimated international sunspot number	073 - Based on 26 stations

Noticeable events summary

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

All times in UTC

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