Viewing archive of Sunday, 21 September 2014

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2014 Sep 21 1314 UTC

SIDC Forecast

Solar flares

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

Geomagnetism

Quiet (A<20 and K<4)

Solar protons

Quiet

	10cm flux	Ap
21 Sep 2014	113	009
22 Sep 2014	117	008
23 Sep 2014	120	006

Bulletin

The strongest flare reported in last 24 hours is still ongoing C5.2 flare (peaked at 11:53 UT). The flare seem to originate from the NOAA AR 2166. Two eruptions of filaments situated at the center of the solar disc, on September 20 (at about 06:00 UT) and on September 21 (at about 02:10 UT), did not seem to be associated with wide CMEs. Majority of the recent flaring activity originated from NOAA AR 2171 and NOAA AR 2172 currently situated close to the east solar limb. We expect C-class flares and possibly also an isolated M-class flare in the coming hours, in particular from these two active regions. The solar wind speed remains to have value of about 520 km/s. The interplanetary magnetic field magnitude is stable with the value of 4 nT. The geomagnetic conditions are quiet and expected to remain so in the following 48 hours.

Today's estimated international sunspot number (ISN): 066, based on 12 stations.

Solar indices for 20 Sep 2014

Wolf number Catania	///
10cm solar flux	119
AK Chambon La Forêt	008
AK Wingst	005
Estimated Ap	005
Estimated international sunspot number	045 - Based on 16 stations

Noticeable events summary

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

All times in UTC

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