Viewing archive of Saturday, 25 April 2015

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2015 Apr 25 1230 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
25 Apr 2015	131	006
26 Apr 2015	127	016
27 Apr 2015	123	015

Bulletin

Solar activity was low. The largest flare of the period was a C1.7 flare peaking at 19:27UT from Catania group 32 (NOAA region 2324). Further C flaring was recorded from Catania groups 37 and 39 (NOAA regions 2331 and 2326 respectively). Most regions on disc are stable or in decay, while further growth and development was observed in the intermediate section of Catania group 37 (NOAA region 2331). Flaring at C level is expected over the next days. No Earth directed CME's have been recorded. Solar wind was nominal with solar wind speed dropping further from 380 km/s to around 340 km/s as well as total magnetic field dropping further from around 5 nT to around 3 nT. Bz was positive over most of the period and the phi angle was stable in the outward sector. Geomagnetic conditions were mostly quiet (NOAA Kp 0-1) with only an unsettled period locally (local K Dourbes 3 around 16UT while otherwise 0-2). Nominal solar wind conditions with associated quiet to unsettled geomagnetic conditions are expected, with possibly a sector boundary change slightly enhancing solar wind conditions and potentially causing active geomagnetic conditions.

Today's estimated international sunspot number (ISN): 051, based on 04 stations.

Solar indices for 24 Apr 2015

Wolf number Catania	///
10cm solar flux	135
AK Chambon La Forêt	005
AK Wingst	003
Estimated Ap	003
Estimated international sunspot number	064 - Based on 24 stations

Noticeable events summary

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

All times in UTC

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