Viewing archive of Sunday, 26 April 2015

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2015 Apr 26 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
26 Apr 2015	123	008
27 Apr 2015	121	015
28 Apr 2015	119	007

Bulletin

Solar flaring activity was low with just two C flares occurring over the period. The largest was a long duration event from over the western limb, peaking at 18:49UT at C1.9 magnitude. It was associated with an eruption and CME, which appears to be not directed to Earth. Another C1.0 flare from Catania group 37 (NOAA region 2331) peaked just before the end of the period at 11:49UT. Flaring at C level is expected over the next days. An asymmetric full halo CME was also visible in SoHO/LASCO coronagraph data from 14:48UT onwards in the C2 field of view. No related on disc activity could be associated, and the event is believed to be backsided and hence not geoeffective. Solar wind was at nominal levels with speeds in the 290-330 km/s range and total magnetic field in the 2.1-4.6 nT range. Bz was variable though initially mostly positive. Phi angle was stable in the outward sector. Geomagnetic conditions were quiet to unsettled (NOAA Kp 0-1, local K Dourbes 0-3). Nominal solar wind conditions with associated quiet to unsettled geomagnetic conditions are expected to continue over the next days. Some possible sector boundary crossings could slightly enhance solar wind conditions.

Today's estimated international sunspot number (ISN): 042, based on 11 stations.

Solar indices for 25 Apr 2015

Wolf number Catania	///
10cm solar flux	126
AK Chambon La Forêt	003
AK Wingst	002
Estimated Ap	001
Estimated international sunspot number	051 - Based on 16 stations

Noticeable events summary

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

All times in UTC

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