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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2014 Jul 30 1251 UTC

SIDC Forecast

Brillamenti solari

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

Geomagnetism

Quiet (A<20 and K<4)

Protoni solari

Quiet

	10cm flux	Ap
30 Jul 2014	150	006
31 Jul 2014	155	004
01 Aug 2014	160	004

Bulletin

The largest event of the period was a C4 flare peaking at 16:33UT on 29 July in the trailing portion of NOAA 2130. This area shows some mixed magnetic polarities and was also the source of one C3 and three C1 flares. NOAA 2125 and 2127 contributed with a C1 flare each. NOAA 2126 has simplified and remained quiet. The long filament in the NE quadrant erupted early this morning between 04:30 and 05:30UT. According to the currently available STEREO-imagery, the associated CME was directed mostly to the north and away from Earth. Another CME was first observed by SOHO/LASCO at 01:25UT and was also associated to a filament eruption at or just behind the east limb. This CME is not directed to Earth. The filaments near the NE-limb and south near the Central Meridian (CM) were relatively stable. Further C-class flaring is expected, with a small chance for an M-class flare from NOAA 2127 and 2130. Solar wind speed declined further from 350 to 310 km/s, with Bz varying between -5 and +3 nT. A small equatorial hole is approaching the CM and may influence the geomagnetic field around 4 August. Geomagnetic conditions were quiet and are expected to remain so.

Today's estimated international sunspot number (ISN): 097, based on 18 stations.

Solar indices for 29 Jul 2014

Wolf number Catania	189
10cm solar flux	142
AK Chambon La Forêt	009
AK Wingst	004
Estimated Ap	004
Estimated international sunspot number	105 - Based on 29 stations

Noticeable events summary

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

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