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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2017 Nov 27 1230 UTC

SIDC Forecast

Brillamenti solari

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

Geomagnetism

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

Protoni solari

Quiet

	10cm flux	Ap
27 Nov 2017	075	011
28 Nov 2017	074	013
29 Nov 2017	074	008

Bulletin

Solar activity was at very low levels. NOAA 2689 is the only visible sunspot group and was the source of a B2.9 event peaking at 11:17UT. Several filaments are present in the northern hemisphere, as well as a long filament in the SW quadrant. 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.

The direction of the interplanetary magnetic field switched from away to towards the Sun around noon on 26 November. It was accompanied by a gradual increase in solar wind density, likely from the stream interaction region preceding the expected high speed stream (HSS) from the negative equatorial coronal hole (CH). Solar wind speed was around 300 km/s until 19:00UT, when it started a gradual increase to its current values between mostly 400 and 430 km/s (DSCOVR). Bz varied between -6 and +10 nT.

The geomagnetic field was at quiet levels throughout the period. Increasing wind speeds are expected in response to the full arrival of the HSS later today, which may result in unsettled to active geomagnetic conditions. A glancing blow from the 25 November CME is possible and may result in unsettled conditions late on 28 or on 29 November.

Today's estimated international sunspot number (ISN): 016, based on 09 stations.

Solar indices for 26 Nov 2017

Wolf number Catania	///
10cm solar flux	076
AK Chambon La Forêt	006
AK Wingst	002
Estimated Ap	002
Estimated international sunspot number	019 - Based on 25 stations

Noticeable events summary

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

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