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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2016 Oct 24 1231 UTC

SIDC Forecast

Brillamenti solari

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

Geomagnetism

Major magstorm expected (A>=50 or K>=6)

Protoni solari

Quiet

	10cm flux	Ap
24 Oct 2016	076	011
25 Oct 2016	076	045
26 Oct 2016	076	050

Bulletin

Solar activity was very low, with no x-ray flaring observed. The sole sunspot region that is currently visible, NOAA 2603, is small and decaying. No earth-directed coronal mass ejections (CMEs) were observed.

Solar flare activity is expected to remain below the C-class level.

Solar wind speed decreased from about 440 km/s to its current values near 380 km/s. Bz fluctuated between -8 nT and +6 nT, and was mostly negative. Quiet to unsettled geomagnetic conditions were observed, with an isolated active episode near midnight. The interplanetary magnetic field was mostly directed away from the Sun (positive). A huge, positive, recurrent coronal home (CH) is transiting the central meridian.

Mostly quiet to unsettled geomagnetic conditions are expected until the arrival of the co-rotating interaction region (CIR) preceding the high speed stream (HSS) from the aforementioned CH. This arrival is currently foreseen for 25 October, with minor geomagnetic storming possible from then onwards. There's a good chance on an isolated moderate storm interval (K-index = 6).

Today's estimated international sunspot number (ISN): 015, based on 04 stations.

Solar indices for 23 Oct 2016

Wolf number Catania	///
10cm solar flux	077
AK Chambon La Forêt	///
AK Wingst	011
Estimated Ap	010
Estimated international sunspot number	016 - Based on 17 stations

Noticeable events summary

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

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