Viewing archive of Friday, 5 September 2014

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2014 Sep 05 1248 UTC

SIDC Forecast

Solar flares

Active (M-class flares expected, probability >=50%)

Geomagnetism

Quiet (A<20 and K<4)

Solar protons

Warning condition (activity levels expected to increase, but no numeric forecast given)

	10cm flux	Ap
05 Sep 2014	150	007
06 Sep 2014	155	003
07 Sep 2014	160	003

Bulletin

Eight C-class flares were produced, mainly by Catania sunspot group 45, 44 and 40 (NOAA AR 2157, 2155 and 2152 respectively). The strongest flare was a C6.7 flare, peaking at 6:54 UT on September 5, originating from Catania group 45. A partial halo CME (apparent width of about 120 degrees), with first measurement at 7:12 UT in SOHO/LASCO C2, was associated with this flare. The CME is travelling East of the Sun-Earth line with a projected plane-of-the-sky speed of 650 km/s and is not expected to arrive at Earth. We expect flaring activity up to the M-level, in particular from the Catania groups 44 and 45 and the former NOAA AR 2139. The solar proton flux currently remains stable below the SEP event threshold. We maintain the warning condition for a proton event. The Earth is currently inside a slow (around 370 km/s) solar wind flow with average (around 5 nT) interplanetary magnetic field magnitude. The geomagnetic conditions are quiet and are expected to remain so.

Today's estimated international sunspot number (ISN): 075, based on 09 stations.

Solar indices for 04 Sep 2014

Wolf number Catania	114
10cm solar flux	146
AK Chambon La Forêt	010
AK Wingst	007
Estimated Ap	008
Estimated international sunspot number	085 - Based on 18 stations

Noticeable events summary

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

All times in UTC

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