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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2021 Nov 29 1238 UTC

SIDC Forecast

Brillamenti solari

C-class flares expected, (probability >=50%)

Geomagnetism

Quiet (A<20 and K<4)

Protoni solari

Quiet

	10cm flux	Ap
29 Nov 2021	093	015
30 Nov 2021	094	005
01 Dec 2021	094	010

Bulletin

Solar activity was at very low levels over the past 24 hours. There are three Active Regions (AR) visible on the Sun. NOAA AR 2899 has now rotated over the west limb, while a new simple region (NOAA AR 2901, alpha magnetic field configuration) has emerged in the North East quadrant. NOAA AR 2898 and 2900 are the largest regions on disk, both with beta magnetic field configuration. There is estimated to be a 50 percent probability of C-class flares in the next 24 hours.

There was a filament eruption observed in the southern hemisphere, visible from 06UT Nov 29. The bulk of the eruption appears to be directed to the south of the Sun-Earth line but a full analysis will be made when coronagraph data become available. No Earth directed Coronal Mass Ejections (CMEs) have been detected in the available coronagraph imagery.

The greater than 10 MeV proton flux was at nominal levels in the past 24 hours and is expected to remain at nominal levels in the next 24 hours. The greater than 2 MeV electron flux was below the 1000 pfu alert threshold in the past 24 hours and is expected to remain so in the next 24 hours. The greater than 2 MeV electron fluence was at nominal levels in the past 24 hours, and is expected to stay at nominal levels in the next 24 hours.

The magnetic field was enhanced at the start of the period, due to the ongoing passage of the ICME that arrived on Nov 27. The magnetic field gradually decreased from 12 to 5 nT over the past 24 hours. Bz varied between -7 and 9 nT, with an extended period of negative Bz between 16UT Nov 28 and 05UT Nov 29. The solar wind speed remained low, oscillating around 390 km/s.

Geomagnetic conditions were at quiet to active levels (NOAA Kp and K-BEL recorded values of 1-4). Geomagnetic conditions are expected to be quiet to unsettled on Nov 29 and Nov 30.

Today's estimated international sunspot number (ISN): 039, based on 17 stations.

Solar indices for 28 Nov 2021

Wolf number Catania	///
10cm solar flux	092
AK Chambon La Forêt	019
AK Wingst	011
Estimated Ap	010
Estimated international sunspot number	044 - Based on 13 stations

Noticeable events summary

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

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