Viewing archive of Monday, 31 August 2015

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2015 Aug 31 1231 UTC

SIDC Forecast

Solar flares

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

Geomagnetism

Quiet (A<20 and K<4)

Solar protons

Quiet

	10cm flux	Ap
31 Aug 2015	094	013
01 Sep 2015	094	024
02 Sep 2015	094	021

Bulletin

Solar flaring activity was at low levels with region 2403 producing the only noteworthy flare of the period, a C2.2 flare peaking at 5:22UT from at the West limb. New flux emergence was noted near N15W48 as well as near S15E70 which were numbered NOAA active regions 2407 and 2408 repectively. Some more flux emergence appears to be visible near N15W10. The regions currently on disk are not very complicated or active, but together with also the new emerging regions developing we judge that there do remains a fair chance for C flaring in the next 24 hours. The warning condition for a proton event is lifted with the departure of active region 2403 behind the West limb. No Earth directed CME's were recorded. Solar wind showed the decay of the influence of the negative polarity equatorial coronal hole high speed stream. Speeds dropped to around 390 km/s. Total magnetic field was around 5 nT with Bz variable. Geomagnetic conditions were quiet at planetary level (NOAA Kp 1-2) with some unsettled periods locally (local K Dourbes 0-3). A further decay to nominal solar wind conditions and associated quiet geomagnetic conditions is expected in the first 24 hour. Afterwards, a sector boundary crossing followed by the influence of the positive polarity equatorial coronal hole high speed stream is expected to elevate solar wind conditions with active to minor geomagnetic storms possible.

Today's estimated international sunspot number (ISN): 035, based on 18 stations.

Solar indices for 30 Aug 2015

Wolf number Catania	///
10cm solar flux	092
AK Chambon La Forêt	008
AK Wingst	///
Estimated Ap	006
Estimated international sunspot number	045 - Based on 30 stations

Noticeable events summary

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

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