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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2014 Apr 27 1225 UTC

SIDC Forecast

Valid from 1230 UTC, 27 Apr 2014 until 29 Apr 2014
Brillamenti solari

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

Geomagnetism

Quiet (A<20 and K<4)

Protoni solari

Quiet

10cm fluxAp
27 Apr 2014118005
28 Apr 2014116009
29 Apr 2014114005

Bulletin

NOAA 2038 produced the only C flare of the period (C2 peaking at 14:59UT), just before rounding the west limb. Current imagery shows 6 sunspot groups, most having magnetically simple configurations. One region developed overnight in the northwest quadrant, while two other regions rounded the east limb. There are also a few 15-20 degrees long filaments visible near the central meridian and in the southwest quadrant. C-class flares remain possible. Solar wind speed decreased further from around 380 to 350km/s. Bz varied between -4 and +3nT, and became predominantly northward around midnight. The particle stream from a small equatorial coronal hole that passed the central meridian early on 24 April, is expected to arrive at Earth later today or tomorrow. The geomagnetic field has been quiet and is expected to remain so. Locally, a brief active interval is possible from the effect of the coronal hole.

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

Solar indices for 26 Apr 2014

Wolf number Catania///
10cm solar flux121
AK Chambon La Forêt008
AK Wingst006
Estimated Ap005
Estimated international sunspot number032 - Based on 19 stations

Noticeable events summary

DayBeginMaxFineLocStrengthOP10cmCatania/NOAARadio burst types
Nessuna

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

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