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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2014 Sep 14 1231 UTC

SIDC Forecast

Brillamenti solari

Active (M-class flares expected, probability >=50%)

Geomagnetism

Quiet (A<20 and K<4)

Protoni solari

Quiet

	10cm flux	Ap
14 Sep 2014	143	004
15 Sep 2014	141	005
16 Sep 2014	141	005

Bulletin

There are currently 6 sunspot groups visible on the solar disk. Eight low-level C-class flares and one M-class flare were observed during the period. The latter reached a maximum of M1.5 at 02:16UT, and originated in NOAA 2157. The CME associated to this event was first observed by LASCO at 03:12UT. It had a speed of about 350 km/s (CACTus), but has no Earth- directed component. NOAA 2157 and NOAA 2158 continue their decay. However, together with NOAA 2164, they have spots of opposite magnetic polarity close to each other. Hence, they may still produce an M-class flare. Filament eruptions observed around 16:30UT (northeast quadrant) and 20:00UT (south of NOAA 2163) were not related to earth-directed CMEs. M-class flares remain possible. Solar wind speed decreased from about 600 km/s to 500 km/s, while Bz decreased from +15 nT to a steady +6 nT. Geomagnetic conditions were quiet and are expected to remain so.

Today's estimated international sunspot number (ISN): 070, based on 10 stations.

Solar indices for 13 Sep 2014

Wolf number Catania	///
10cm solar flux	145
AK Chambon La Forêt	015
AK Wingst	014
Estimated Ap	014
Estimated international sunspot number	085 - Based on 21 stations

Noticeable events summary

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

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