Viewing archive of Wednesday, 23 April 2014

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2014 Apr 23 1228 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
23 Apr 2014	138	003
24 Apr 2014	134	005
25 Apr 2014	132	005

Bulletin

Only 5 low-level C-class flares were recorded over the last 24 hours. Active regions NOAA 2038 (2), 2035 (1) and 2034 (2, from behind the west limb) were the sources. A CME first visible in LASCO/C2 at 15:12UT originated from a filament eruption in the northeast solar quadrant. Another CME, first visible in LASCO/C2 at 16:36UT, was related to a backside solar flare. None of these CMEs has an earth-directed component. Further C-class flaring is expected. Solar wind speed has been varying between 400 and 450km/s, with Bz between -4 and +2nT. A small equatorial coronal hole will reach the central meridian tonight. The geomagnetic field may be impacted around 27 April. Geomagnetic conditions have been quiet, and are expected to remain so.

Today's estimated international sunspot number (ISN): 063, based on 17 stations.

Solar indices for 22 Apr 2014

Wolf number Catania	///
10cm solar flux	145
AK Chambon La Forêt	007
AK Wingst	004
Estimated Ap	003
Estimated international sunspot number	095 - Based on 23 stations

Noticeable events summary

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

All times in UTC

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