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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2013 Sep 21 1358 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
21 Sep 2013	108	008
22 Sep 2013	110	015
23 Sep 2013	115	011

Bulletin

Solar activity is still low with the flaring at the C-class level. The strongest flare reported was C3.8 flare, peaking at 12:03 UT on September 20. All the C-class flares, in last 48 hours originated from the same NOAA AR 1850 which still has potential to produce C-class, and possibly M-class flares. Earth is inside the slow solar wind with the speed of about 410 km/s.The interplanetary magnetic field magnitude is stable having value of about 5 nT. The geomagnetic conditions are at the moment quiet. We expect quiet to active geomagnetic conditions in the following 48 hours due to the arrival of a fast flow (in the morning of September 22), associated with the low-latitude coronal hole in the northern hemisphere. The CME associated with the prominence eruption from September 19 is expected to arrive at the Earth on September 23.

Today's estimated international sunspot number (ISN): 053, based on 08 stations.

Solar indices for 20 Sep 2013

Wolf number Catania	///
10cm solar flux	109
AK Chambon La Forêt	013
AK Wingst	010
Estimated Ap	008
Estimated international sunspot number	061 - Based on 19 stations

Noticeable events summary

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

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