Viewing archive of Monday, 28 April 2014

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2014 Apr 28 1232 UTC

SIDC Forecast

Solar flares

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

Geomagnetism

Active conditions expected (A>=20 or K=4)

Solar protons

Quiet

	10cm flux	Ap
28 Apr 2014	120	014
29 Apr 2014	124	008
30 Apr 2014	124	005

Bulletin

Six sunspot regions are visible at the front side of the solar disk. All have a simple alpha or beta magnetic configuration. The background of the GOES Xray flux is at B-class level and no noteworthy flares were measured. A weak CME erupted towards the north, first visible in LASCO/C2 at 5:36 UT on 28 April. It can hardly be called a partial halo CME and does not seem to be Earth directed. C-class flaring activity can be expected for the next 48 hours. Solar wind speed is relatively stable with values between 300 to 350km/s. The magnitude of the interplanetary magnetic field was maximally 5 nT with a mainly negative Bz. Geomagnetic conditions were unsettled and are expected to remain as such. An isolated time slot of active conditions is possible at arrival of a high speed stream related to the coronal hole that passed the central meridian early on 24 April.

Today's estimated international sunspot number (ISN): 057, based on 10 stations.

Solar indices for 27 Apr 2014

Wolf number Catania	///
10cm solar flux	118
AK Chambon La Forêt	009
AK Wingst	004
Estimated Ap	003
Estimated international sunspot number	057 - Based on 21 stations

Noticeable events summary

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

All times in UTC

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