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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2017 Oct 05 1230 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
05 Oct 2017	086	009
06 Oct 2017	086	015
07 Oct 2017	084	010

Bulletin

Solar activity was at very low levels. The two visible sunspot groups, NOAA 2683 (Catania 57) and NOAA 2682 (Catania 56), produced 2 low- level B-class flares each. NOAA 2683 displayed a moderate size increase of some small opposite polarity sunspots south of the main spot, whereas NOAA 2682 still features a long filament to the east and north of the main spot. 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 a small chance on a C-class flare.

Solar wind speed varied between 360 and 380 km/s before 23UT, and between 380 and 410 km/s for the rest of the period (DSCOVR). Bz fluctuated between -6 and +7 nT, being predominantly positive after midnight. The interplanetary magnetic field was mostly directed towards the Sun.

The geomagnetic field was at quiet to unsettled levels, and is expected to remain so. The particle stream associated with a small negative equatorial coronal hole is still expected to arrive at Earth, late on 05 or on 06 October. This may increase the likelihood on an active geomagnetic episode.

Today's estimated international sunspot number (ISN): 029, based on 14 stations.

Solar indices for 04 Oct 2017

Wolf number Catania	///
10cm solar flux	087
AK Chambon La Forêt	010
AK Wingst	007
Estimated Ap	006
Estimated international sunspot number	028 - Based on 21 stations

Noticeable events summary

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

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