Viewing archive of Friday, 31 May 2013

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2013 May 31 1250 UTC

SIDC Forecast

Solar flares

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

Geomagnetism

Minor storm expected (A>=30 or K=5)

Solar protons

Quiet

	10cm flux	Ap
31 May 2013	102	012
01 Jun 2013	104	029
02 Jun 2013	104	010

Bulletin

Two C-class flares were observed during the past few hours. A C1.4 flare at 7h57 UT originating from Catania sunspot group 82 (NOAA AR 1756) was a long duration event. This is associated with a rather small limb CME propagating to the South West and based on currently available information it is expected not to be Earth directed. A C1.1 flare at 11h27 UT was originating from Catania sunspot group 88 (NOAA AR 1761). C-class flaring activity is expected for the next 48 hours. The current solar wind speed is at 350 km/s. The interplanetary magnetic field has a magnitude of 5 nT with a mainly negative Bz-component. Geomagnetic conditions are still quiet (local K<3 at Dourbes). The geomagnetic index is expected to increase later today and tomorrow and reach active to minor storm levels (K=4 to 5), due to the effects of a fast speed stream.

Today's estimated international sunspot number (ISN): 041, based on 20 stations.

Solar indices for 30 May 2013

Wolf number Catania	///
10cm solar flux	104
AK Chambon La Forêt	006
AK Wingst	002
Estimated Ap	002
Estimated international sunspot number	052 - Based on 13 stations

Noticeable events summary

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

All times in UTC

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