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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2013 Sep 25 1242 UTC

SIDC Forecast

Brillamenti solari

Quiet conditions (<50% probability of C-class flares)

Geomagnetism

Quiet (A<20 and K<4)

Protoni solari

Quiet

	10cm flux	Ap
25 Sep 2013	110	006
26 Sep 2013	110	005
27 Sep 2013	110	006

Bulletin

NOAA active region 1846/ Catania 79 produced a C1.1 flare on September 24. Although the chances for more C-flares are small, we end the all-quiet- alert. ACE data show now a clear coronal hole signature. The solar wind plasma has a speed just below 450 km/s. It took this plasma around 4 days to bridge the distance Sun-Earth. On September 20, a northern coronal hole passed the central meridian. The co-rotating interaction region (CIR) followed by a fast wind measured by ACE, is probably linked to this hole. The CIR was responsible for 1 interval of Kp=4 on September 24. We expect quiet geomagnetic conditions, with Kp below 3.

Today's estimated international sunspot number (ISN): 052, based on 19 stations.

Solar indices for 24 Sep 2013

Wolf number Catania	073
10cm solar flux	110
AK Chambon La Forêt	020
AK Wingst	012
Estimated Ap	011
Estimated international sunspot number	046 - Based on 24 stations

Noticeable events summary

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

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