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Daily bulletin on solar and geomagnetic activity from the SIDC

Випущено: 2017 Oct 08 1230 UTC

SIDC Forecast

Сонячні спалахи

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

Geomagnetism

Quiet (A<20 and K<4)

Сонячні протони

Quiet

	10cm flux	Ap
08 Oct 2017	077	003
09 Oct 2017	075	003
10 Oct 2017	074	006

Bulletin

Solar activity was at very low levels. NOAA 2683 (Catania 57) had rotated over the west limb by the end of the period. It was the source of a B5 flare peaking on 08 October at 06:47UT. A small bipolar sunspot region emerged near N15W35. No earth-directed coronal mass ejections (CMEs) were observed in available coronagraphic imagery. The greater than 10 MeV proton flux was at nominal levels.

Quiet flaring conditions are expected, with still a slight chance on an isolated C-class flare.

Solar wind speed varied between 400 and 460 km/s (DSCOVR). Bz fluctuated between -5 and +6 nT, being mostly positive after 04UT. The interplanetary magnetic field was mostly directed towards the Sun. The extension of a positive polar CH started its transit of the Central Meridian early on 07 October and may influence the earth environment around 10-11 October.

The geomagnetic field was at quiet levels, with unsettled levels reached in Dourbes at the end of the period. Mostly quiet geomagnetic conditions are expected, with a chance on an isolated unsettled interval.

Today's estimated international sunspot number (ISN): 000, based on 14 stations.

Solar indices for 07 Oct 2017

Wolf number Catania	///
10cm solar flux	080
AK Chambon La Forêt	009
AK Wingst	004
Estimated Ap	003
Estimated international sunspot number	013 - Based on 18 stations

Noticeable events summary

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

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