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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2017 Oct 03 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
03 Oct 2017	085	010
04 Oct 2017	085	010
05 Oct 2017	084	015

Bulletin

Solar activity was at very low levels. The 2 visible sunspot groups were quiet. 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 390 and 440 km/s (DSCOVR), ending the period near 410 km/s. Bz fluctuated between -6 and +5 nT. The interplanetary magnetic field was mostly directed away from the Sun, with "towards" excursions from 02UT onwards. A small negative equatorial coronal hole (CH) transited the central meridian on 01-03 October.

The geomagnetic field was at quiet to unsettled levels, and is expected to remain so. The particle stream associated with the aforementioned CH may start influencing the earth environment on 04 or 05 October, increasing the likelihood on an active geomagnetic episode.

Today's estimated international sunspot number (ISN): 027, based on 16 stations.

Solar indices for 02 Oct 2017

Wolf number Catania	///
10cm solar flux	086
AK Chambon La Forêt	010
AK Wingst	005
Estimated Ap	006
Estimated international sunspot number	034 - Based on 29 stations

Noticeable events summary

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

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