Viewing archive of Thursday, 30 November 2017

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2017 Nov 30 1230 UTC

SIDC Forecast

Solar flares

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

Geomagnetism

Active conditions expected (A>=20 or K=4)

Solar protons

Quiet

	10cm flux	Ap
30 Nov 2017	072	012
01 Dec 2017	071	008
02 Dec 2017	070	005

Bulletin

Solar activity was at very low levels. Decaying sunspot region NOAA 2689 was quiet and is approaching the NW limb. It has developed a filament in its spotless trailing section. The 40 degrees long filament is rounding the SW limb quietly. 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 slight chance on an isolated C-class flare.

Solar wind speed values around 400 km/s were recorded until about 19UT, when the wind stream associated with the southern polar coronal hole (CH) extension arrived and gradually drove the speed to values near 510 km/s around 09UT. Bz oscillated between +7 nT and -9 nT. The interplanetary magnetic field was mostly directed towards the Sun. Solar wind parameters did not show any obvious sign of the 25 November CME which has most likely missed the Earth.

The geomagnetic field was quiet to unsettled throughout the period, with Kp at active levels during the 03-06UT interval. Mostly quiet to unsettled conditions are expected, with a possibility on another active episode.

Today's estimated international sunspot number (ISN): 011, based on 09 stations.

Solar indices for 29 Nov 2017

Wolf number Catania	///
10cm solar flux	073
AK Chambon La Forêt	015
AK Wingst	005
Estimated Ap	004
Estimated international sunspot number	014 - Based on 20 stations

Noticeable events summary

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

All times in UTC

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