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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2013 Sep 26 1209 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
26 Sep 2013	111	004
27 Sep 2013	109	005
28 Sep 2013	109	007

Bulletin

The Sun is quiet when it comes to flaring activity. NOAA AR 1850/Catania 83 produced a few B-flares. We expect that the X-ray radiation stays at a low level. The solar wind speed peaked on September 25 around 450 km/s and decreased slowly to a speed of 350 km/s today, September 26. Late September 25, the Earth crossed a sector boundary (SB). The interplanetary magnetic field changed from an inward to an outward direction, the density of the solar wind plasma has changed slightly. The SB crossing did not have geomagnetic consequences. A small northern coronal hole (between 35° and 50° latitude) will pass the central meridian today, September 26. We expect the geomagnetic conditions to stay quiet for the next 48 hours.

Today's estimated international sunspot number (ISN): 038, based on 13 stations.

Solar indices for 25 Sep 2013

Wolf number Catania	099
10cm solar flux	111
AK Chambon La Forêt	005
AK Wingst	004
Estimated Ap	004
Estimated international sunspot number	054 - Based on 23 stations

Noticeable events summary

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

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