Viewing archive of Thursday, 25 April 2013

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2013 Apr 25 1244 UTC

SIDC Forecast

Solar flares

Eruptive (C-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
25 Apr 2013	115	005
26 Apr 2013	114	004
27 Apr 2013	113	004

Bulletin

NOAA AR 1726 remains very dynamic. As it rotates over the solar west limb in the coming 24h, it could still produce a large flare before disappearing out of Earth view. The solar wind speed is still increasing as a result of the influence of a recurrent coronal hole. Nevertheless we expect that most of the resulting geomagnetic activity has passed. Hence we predict quiet geomagnetic conditions. A halo CME was observed by SOHO/LASCO first seen in the C2 field of view at April 23 00:48. However as this CME was determined to be back sided, we do not expect geomagnetic consequences.

Today's estimated international sunspot number (ISN): 077, based on 17 stations.

Solar indices for 24 Apr 2013

Wolf number Catania	///
10cm solar flux	115
AK Chambon La Forêt	029
AK Wingst	024
Estimated Ap	023
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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