Viewing archive of Saturday, 1 June 2013

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2013 Jun 01 1259 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
01 Jun 2013	102	053
02 Jun 2013	102	015
03 Jun 2013	102	003

Bulletin

During the past 24 hours an M1.0 flare erupted from Catania sunspot group 90 (NOAA AR 1760) at 20:00 UT on May 31. This was associated with type II (speed of 1393 km/s) and type IV radio bursts. No associated strong CMEs were observed at that time. CACTus detected a partial halo CME on May 31 associated with a broad filament eruption on the north (oriented from NE to SW). It involves two successive CMEs: one with signatures in LASCO at 11:48 UT and one starting at 17:24 UT. Both CMEs mainly have a North-ward oriented component and are not oriented to the Earth. C-class flaring activity is expected and there exits a slight chance for an M-class flare. Biggest candidates are Catania sunspot groups 88 and 90. A shock was observed in the solar wind speed on May 31 around 15:30 UT. The speed went up from around 350 km/s to around 650 km/s and also corresponds to a jump in the solar wind temperature and density. On June 1, the interplanetary magnetic field reached a magnitude around 20 nT with Bz component varying between -20 and +15 nT. This is related to the arrival of a corotating- interaction region (CIR) related to the coronal hole (CH). The K index has reached storm levels (K up to 6 measured at Dourbes). We expect the minor storm conditions to continu for today activity will decrease to unsettled to active conditions tomorrow.

Today's estimated international sunspot number (ISN): 044, based on 14 stations.

Solar indices for 31 May 2013

Wolf number Catania	073
10cm solar flux	102
AK Chambon La Forêt	044
AK Wingst	012
Estimated Ap	011
Estimated international sunspot number	039 - Based on 31 stations

Noticeable events summary

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

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