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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2013 Jul 10 1217 UTC

SIDC Forecast

Brillamenti solari

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

Geomagnetism

Active conditions expected (A>=20 or K=4)

Protoni solari

Quiet

	10cm flux	Ap
10 Jul 2013	120	019
11 Jul 2013	124	007
12 Jul 2013	124	003

Bulletin

Solar flaring activity mainly originated from Catania sunspot group 26 (NOAA AR 1787), featuring 3 C-class flares in the past 24 hours. The C4.9 flare at 6h40 UT on the 10th was the largest one. For the next 48 hours C-flaring activity is expected to continue, with Catania sunspot groups 24 and 26 (NOAA AR 1785 and 1787) as main source candidates. LASCO/C2 detected a halo CME at 15h24 UT on the 9th. It was associated with a broad filament eruption (NE to SW oriented) in the northern hemisphere. The CME is travelling with an estimated speed of 440 km/s and is expected to arrive at Earth on the 13th around 13h UT. A shock in the solar wind speed was observed at 20h UT on the 9th. Solar wind speed currently is at 440 km/s. The magnitude of the interplanetary magnetic field is around 10 nT, with a mainly negative z-component. Geomagnetic conditions are unsettled to active and are expected to remain so for the next few hours, before returning to quiet conditions.

Today's estimated international sunspot number (ISN): 054, based on 15 stations.

Solar indices for 09 Jul 2013

Wolf number Catania	125
10cm solar flux	120
AK Chambon La Forêt	027
AK Wingst	015
Estimated Ap	012
Estimated international sunspot number	074 - Based on 27 stations

Noticeable events summary

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

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