Viewing archive of Saturday, 31 May 2014

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2014 May 31 1243 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
31 May 2014	107	003
01 Jun 2014	111	003
02 Jun 2014	115	006

Bulletin

Over the last 24 hours, only one C-class flare was observed. This C1-flare peaked on 31 May at 07:05UT, and originated from the active region that is about to round the east-northeast limb. There are currently 5 sunspot groups visible. They are all small and magnetically simple. There's a small chance on a C-class flare, in particular from the region near the east-northeast limb. Solar wind speed varied mostly between 320 and 360 km/s. Bz was initially negative with excursions up to -11nT. Around 19:00UT on 30 May, Bz turned positive reaching +10nT, and stayed mostly positive for the remainder of the period. The geomagnetic field was quiet with locally an active episode. A small coronal hole that passed the central meridian on 29 May can influence the geomagnetic field as of 2 June. Geomagnetic conditions are expected to remain quiet, though locally a brief active episode is possible.

Today's estimated international sunspot number (ISN): 039, based on 19 stations.

Solar indices for 30 May 2014

Wolf number Catania	081
10cm solar flux	102
AK Chambon La Forêt	020
AK Wingst	014
Estimated Ap	013
Estimated international sunspot number	040 - Based on 26 stations

Noticeable events summary

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

All times in UTC

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