Viewing archive of Sunday, 27 April 2014

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2014 Apr 27 1225 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
27 Apr 2014	118	005
28 Apr 2014	116	009
29 Apr 2014	114	005

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 flux	121
AK Chambon La Forêt	008
AK Wingst	006
Estimated Ap	005
Estimated international sunspot number	032 - Based on 19 stations

Noticeable events summary

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

All times in UTC

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