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Daily bulletin on solar and geomagnetic activity from the SIDC

Существующий: 2016 Oct 27 1230 UTC

SIDC Forecast

Солнечные вспышки

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

Geomagnetism

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

Солнечные протоны

Quiet

	10cm flux	Ap
27 Oct 2016	078	026
28 Oct 2016	077	031
29 Oct 2016	077	013

Bulletin

Flaring activity remained well below the C-class level during the period. NOAA 2603 was stable, with another small sunspot region developing at N09W45. No earth-directed coronal mass ejections (CMEs) were observed.

Quiet flaring conditions are expected to continue, with a small chance on an isolated C-class flare.

Earth remained under the influence of the high speed stream (HSS) from the huge coronal hole (CH). Solar wind speed decreased from an initial 700 km/s to its current value just below 600 km/s. Bz varied between -5 and +4 nT, being mostly negative. The interplanetary magnetic field (IMF) was directed away from the Sun (positive). Kp ranged from unsettled conditions to moderate geomagnetic storming, while K Dourbes ranged from quiet conditions to minor storming.

Wind speeds are expected to remain above 500 km/s for probably another day, with periods of sustained negative Bz possible. Hence, quiet to minor storm conditions are expected, with still a small chance on an isolated moderate storming interval.

Today's estimated international sunspot number (ISN): 026, based on 14 stations.

Solar indices for 26 Oct 2016

Wolf number Catania	034
10cm solar flux	078
AK Chambon La Forêt	072
AK Wingst	044
Estimated Ap	052
Estimated international sunspot number	026 - Based on 27 stations

Noticeable events summary

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

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