Viewing archive of Saturday, 7 December 2024

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2024 Dec 07 1231 UTC

SIDC Forecast

Solar flares

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

Geomagnetism

Quiet (A<20 and K<4)

Solar protons

Quiet

	10cm flux	Ap
07 Dec 2024	179	011
08 Dec 2024	179	026
09 Dec 2024	177	024

Solar Active Regions and flaring

Solar flaring activity was at low levels, with multiple C-class flares recorded over the past 24 hours. The largest flare was a C7.8 flare (SIDC Flare 2837) peaking on December 07 at 08:59 UTC, associated with SIDC Sunspot Group 305 (NOAA Active Regions 3912; beta). There are currently seven numbered active regions visible on the solar disk. SIDC Sunspot Group 302 (NOAA Active Region 3910; alpha) and SIDC Sunspot Group 331 (NOAA Active Region 3918; alpha) are currently approaching the west limb. SIDC Sunspot Group 288 (NOAA Active Region 3917; beta-gamma) is currently the most complex regions on the disk and was responsible for most of the flaring activity observed during this period together with SIDC Sunspot Group 305. Low flaring activity was also produced by SIDC Sunspot Group 330 (NOAA Active Region 3916; beta). Other regions on the disc have simple configuration of their photospheric magnetic field (alpha and beta) and have not shown any significant flaring activity. Solar flaring activity is expected to be at low levels over the next 24 hours, with C-class flares very likely and M-class flares possible.

Coronal mass ejections

No Earth-directed coronal mass ejections (CMEs) have been detected in the available coronagraph imagery over the past 24 hours.

Coronal holes

A positive polarity coronal hole in the northern hemisphere, SIDC Coronal Hole 82, has been crossing the central meridian since December 6. The associated high-speed stream is expected to arrive at Earth starting from December 9.

Solar wind

Over the past 24 hours, the solar wind parameters (ACE and DSCOVR) reflected slow solar wind conditions. The solar wind speed ranged between 350 km/s and 400 km/s. The interplanetary magnetic field remained below 9 nT. The southward component of the interplanetary magnetic field fluctuated between -4 nT and 5 nT. The interplanetary magnetic field orientation was predominantly in the negative sector (field directed towards the Sun). Slow solar wind conditions are expected to prevail during the next days, with a chance of a weak enhancement on Dec 07-08 due to possible arrival of a high-speed stream from a positive polarity coronal hole.

Geomagnetism

Geomagnetic conditions over the past 24 hours were quiet both globally and locally over Belgium (NOAA Kp: 1- to 2-, K-Bel: 1 to 2). Quiet to unsettled geomagnetic conditions are expected over the next days, with a chance of isolated active periods on December 7-8 due to the possible arrival of a high-speed stream (HSS).

Proton flux levels

The greater than 10 MeV GOES proton was below the 10 pfu threshold over the past 24 hours. It is expected to remain below the threshold level over the next 24 hours

Electron fluxes at geostationary orbit

The greater than 2 MeV electron flux, as measured by the GOES-16 satellite, remained below the 1000 pfu alert threshold, and it is expected to remain below the threshold during the next 24 hours. The 24h electron fluence was at normal levels and is expected to remain at these levels.

Today's estimated international sunspot number (ISN): 140, based on 05 stations.

Solar indices for 06 Dec 2024

Wolf number Catania	185
10cm solar flux	178
AK Chambon La Forêt	007
AK Wingst	006
Estimated Ap	004
Estimated international sunspot number	118 - Based on 16 stations

Noticeable events summary

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

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