Viewing archive of Wednesday, 4 September 2013

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2013 Sep 04 1215 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 Sep 2013	108	008
05 Sep 2013	110	017
06 Sep 2013	112	007

Bulletin

Solar activity has been eruptive during the past 24 hours, featuring nine C flares. The brightest flare (C3.6) peaked at 04:28 UT on September 4 and was produced by NOAA AR 11837 like most C flares in this period. More C flares are likely within the next 48 hours, with a slight chance for an M flare, especially from NOAA AR 11837. The solar wind speed ranged between 380 and 480 km/s in the past 24 hours. In the same period, the Interplanetary Magnetic Field decreased from around 8 to 4 nT. The geomagnetic activity was at quiet levels (K Dourbes between 1 and 3; NOAA Kp between 1 and 3) during the past 24 hours. Quiet conditions (K Dourbes < 4) are expected for September 4 to 6, with a chance for active periods on September 5, due to the effects of a Coronal Hole high speed stream.

Today's estimated international sunspot number (ISN): 052, based on 14 stations.

Solar indices for 03 Sep 2013

Wolf number Catania	///
10cm solar flux	106
AK Chambon La Forêt	013
AK Wingst	008
Estimated Ap	007
Estimated international sunspot number	051 - Based on 21 stations

Noticeable events summary

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

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