Viewing archive of Saturday, 5 December 2020

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2020 Dec 05 1231 UTC

SIDC Forecast

Solar flares

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

Geomagnetism

Quiet (A<20 and K<4)

Solar protons

Quiet

	10cm flux	Ap
05 Dec 2020	094	005
06 Dec 2020	092	007
07 Dec 2020	090	007

Bulletin

Solar activity was low, with the largest flare a C1.6 flare peaking at 00:38 from NOAA AR 2790. NOAA AR 2785 has rotated off the disk. This leaves on disk: NOAA AR 2790, of beta type and source of the mentioned C1.6 flare; NOAA AR 2786, the large alfa region which is in decay and now mostly inactive, though showing a C1.2 flare peaking at 11:29; as well as a new active region that rotated on the disk yesterday, and now seems to develop spots but is yet unnumbered. Further isolated C flaring is possible in the next 24 h.

The C1.6 flare was associated with a dimming and a possibly associated faint and narrow Eastward CME is visible in SoHO/LASCO coronagraph data. It is not expected to influence Earth. No other Earth-directed CMEs have been observed in coronagraph data.

The greater than 10MeV proton flux is near background levels and is expected to remain near 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.

Accuracy of current DSCOVR measurements of Solar wind speed and temperature, seem to suffer from low density conditions. Based also on ACE measurements, Earth is believed to be in a nominal slow Solar wind regime. The interplanetary magnetic field magnitude was in the 4-7.5nT range. Some periods with more sustained southward orientation of the magnetic field occurred recently (with Bz down to -5nT). The phi angle was mostly in the negative sector (towards the Sun). As far as possibly detectable, there are no signs of an influence of the December 1 CME. Essentially nominal Solar wind conditions are expected over the next days.

Geomagnetic conditions were mostly quiet with an isolated local unsettled period recently (local K Dourbes 0-3 and NOAA Kp 0-1). Geomagnetic conditions are expected to be quiet.

Today's estimated international sunspot number (ISN): 036, based on 11 stations.

Solar indices for 04 Dec 2020

Wolf number Catania	///
10cm solar flux	096
AK Chambon La Forêt	002
AK Wingst	000
Estimated Ap	001
Estimated international sunspot number	034 - Based on 16 stations

Noticeable events summary

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

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