Het archief bekijken van zaterdag 13 december 2025

Dagelijks bulletin over zonne- en geomagnetische activiteit van het SIDC

Datum verslag: 2025 Dec 13 1231 UTC

SIDC Prognose

Zonnevlammen

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

Geomagnetisme

Minor storm expected (A>=30 or K=5)

Proton Flux monitor

Quiet

	10cm flux	Ap
13 Dec 2025	127	034
14 Dec 2025	125	011
15 Dec 2025	123	010

Zonnevlekkengebieden en zonnevlammen

Solar flaring activity was low over the past 24 hours, with only C-class flares. The strongest flare was a C3.5 flare (SIDC Flare 6409) peaking at 15:58 UTC on December 12. It was associated with SIDC Sunspot Group 712 (NOAA Active Region 4294), which has since rotated across the west limb. There are currently six numbered active regions on the solar disk. SIDC Sunspot Groups 722, 723 (NOAA Active Regions 4307, 4308) are the most complex Groups, with magnetic type beta- gamma. SIDC Sunspot Group 724 (magnetic type alpha) has emerged near the center of the disk. SIDC Sunspot Groups 687 (NOAA Active Region 4299) has decayed into a plage. The solar flaring activity is expected to be low over the next 24 hours, with C-class flares very likely and a chance for M-class flares.

Coronale massa uitstoten

A prominence eruption was observed in AIA 304 data around 00:30 UTC on December 12, at the southeast limb. An associated slow, wide CME (SIDC CME 609) was observed in LASCO/C2 coronagraph imagery starting around 04:00 UTC on December 12, lifting off from the southeast limb. It is not expected to impact Earth. No other Earth-directed CMEs were observed in the available coronagraph imagery.

Zonnewind

Over the past 24 hours, solar wind parameters (ACE) were enhanced, most likely due to the influence of the high-speed stream from the negative polarity coronal hole (SIDC Coronal Hole 142) and the ongoing influence of an ICME arrival. Speed values increased from around 400 km/s to around 600 km/s. The interplanetary magnetic field values varied between 6 nT and 16 nT. The Bz component varied between -14 nT and 15 nT. The interplanetary magnetic field angle was mostly in the negative sector. Enhanced solar wind conditions are expected to persist over the next 24 hours due to the continued influence of the high-speed stream.

Geomagnetisme

Geomagnetic conditions globally were mostly at quiet to unsettled levels (NOAA Kp 2 to 3), with an interval of minor storm conditions (NOAA Kp 5) between 18:00 UTC on December 12 and 03:00 UTC on December 13. Locally, geomagnetic conditions were mostly at quiet to active levels (K BEL 2 to 4), with an interval of minor storm conditions (K BEL 5) between 18:00 UTC and 20:00 UTC on December 12. Further minor to moderate geomagnetic storm conditions remain possible over the next 24 hours due to the continued influence of the high-speed stream.

Proton flux niveaus

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

Elektronenfluxen in geostationaire baan

The greater than 2 MeV electron flux measured by GOES 18 and GOES 19 was below the 1000 pfu threshold in the last 24 hours. The greater than 2 MeV electron flux is expected to be below the 1000 pfu threshold over the next 24 hours. The 24-hour electron fluence is presently at normal levels and is expected to remain so over the next 24 hours.

Het geschatte internationale zonnevlekkengetal (ISN) van vandaag: 085, gebaseerd op 06 stations.

Zon indexen voor 12 Dec 2025

Wolfgetal Catania	144
10cm zonneflux	135
AK Chambon La Forêt	044
AK Wingst	033
Geschatte Ap	032
Geschat internationaal zonnevlekkengetal	096 - Gebaseerd op 13 stations

Overzicht opvallende gebeurtenissen

Aangeboden door het Solar Influences Data Analysis Center© - SIDC - Verwerkt door SpaceWeatherLive

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