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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2015 Sep 14 1230 UTC

SIDC Forecast

Brillamenti solari

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

Geomagnetism

Minor storm expected (A>=30 or K=5)

Protoni solari

Quiet

	10cm flux	Ap
14 Sep 2015	099	013
15 Sep 2015	101	029
16 Sep 2015	102	018

Bulletin

The three currently visible sunspot groups have been quiet during the last 24 hours. Only NOAA 2415 is showing some magnetic mixing in its leading portion. No significant flaring has been observed since late on 11 September. No earth-directed coronal mass ejections have been observed.

Mostly quiet flaring conditions are expected, with a small chance on a C-class flare.

Solar wind speed declined from its initial 480 km/s to about 400 km/s around 07:00UT this morning, then rising to its current 500 km/s probably in response to the arrival of the high speed stream (HSS) of the northern coronal hole's extension. Since about 18:00UT, Bz has been oscillating between mostly -9 and +7 nT, with the interplanetary magnetic field pointing away from the Sun. Quiet to active geomagnetic conditions were observed. A wide coronal hole (CH) is transiting the central meridian (CM). Its trailing transequatorial extension is expected to start its CM transit on 15 September.

Mostly active geomagnetic conditions are expected over the next few days, with possible episodes of minor storming on 14 and 15 September, and minor to moderate storming on 18 and 19 September.

Today's estimated international sunspot number (ISN): 052, based on 14 stations.

Solar indices for 13 Sep 2015

Wolf number Catania	///
10cm solar flux	///
AK Chambon La Forêt	020
AK Wingst	014
Estimated Ap	013
Estimated international sunspot number	078 - Based on 20 stations

Noticeable events summary

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

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