Просмотр архива за понедельник, 7 декабря 2020

Daily bulletin on solar and geomagnetic activity from the SIDC

Существующий: 2020 Dec 07 1230 UTC

SIDC Forecast

Солнечные вспышки

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

Geomagnetism

Quiet (A<20 and K<4)

Солнечные протоны

Quiet

	10cm flux	Ap
07 Dec 2020	091	007
08 Dec 2020	091	007
09 Dec 2020	091	013

Bulletin

Solar activity was low, with only a single C-class flare peaking at 13:27 UT on 6 December, at C1.6 level from NOAA AR 2790, this AR decayed from beta to alpha magnetic field configuration. The other region visible is NOAA AR 2791, of beta type. Further isolated C flaring is possible in the next 24 h.

No new Earth-directed CMEs have been observed in coronagraph data.

An elongated equatorial coronal hole of negative polarity crossed the central meridian yesterday and expected to influence Solar wind conditions from December 9 onwards.

The greater than 10 MeV proton flux is at background levels and is expected to remain at background levels. The greater than 2MeV electron flux did not exceed the 1000 pfu alert threshold. The 24h electron fluence was at moderate levels and is expected to remain at normal to moderate levels over the next days.

Solar wind speed was around 400 km/s and the interplanetary magnetic field mostly around 5 nT. Bz never went below -5 nT. The magnetic field phi angle has oriented away from the Sun (positive). Slow solar wind conditions are expected over the next days until December 9 when we are expected to see the onset of a high speed stream from the equatorial negative polarity coronal hole.

Geomagnetic conditions were quiet (local K Dourbes 0-2 and NOAA Kp 0-2). Geomagnetic conditions are expected to be quiet.

Today's estimated international sunspot number (ISN): 021, based on 09 stations.

Solar indices for 06 Dec 2020

Wolf number Catania	///
10cm solar flux	091
AK Chambon La Forêt	011
AK Wingst	007
Estimated Ap	006
Estimated international sunspot number	023 - Based on 13 stations

Noticeable events summary

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

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