Viewing archive of Tuesday, 9 December 2025

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2025 Dec 09 1234 UTC

SIDC Forecast

Solar flares

M-class flares expected (probability >=50%)

Geomagnetism

Active conditions expected (A>=20 or K=4)

Solar protons

Warning condition (activity levels expected to increase, but no numeric forecast given)

	10cm flux	Ap
09 Dec 2025	185	022
10 Dec 2025	184	010
11 Dec 2025	183	020

Solar Active Regions and flaring

Solar flaring activity was high over the past 24 hours, with five M-class flares. The strongest flare was an M3.1 flare (SIDC Flare 6350) peaking at 21:17 UTC on December 8, which was associated with SIDC Sunspot Group 709 (NOAA Active Region 4294, magnetic type beta-gamma-delta). There are currently nine numbered active regions on the solar disk. The most complex one is SIDC Sunspot Group 709 (NOAA Active Region 4294). SIDC Sunspot Groups 719, 720 (both magnetic type beta) have emerged in the southeast quadrant. SIDC Sunspot Group 621 (NOAA Active Region 4295) has decayed into a plage region. The solar flaring activity is expected to be moderate over the next 24 hours, with M-class flares very likely and a small chance for X-class flares.

Coronal mass ejections

A coronal mass ejection (SIDC CME 607) was observed in LASCO/C2 coronagraph data starting at 22:36 UTC on December 08. The CME is directed primarily to the west from the Earth's perspective and is associated with the M1.2 flare (SIDC Flare 6344), peaking at 22:28 UTC on December 08, associated with SIDC Sunspot Group 687 (NOAA Active Region 4299). While the bulk of the ejecta is expected to miss Earth, a glancing blow could be possible from late on December 11. Further analysis is ongoing to better estimate its impact.

Solar wind

Over the past 24 hours, the solar wind parameters (ACE) reflected mostly slow solar wind conditions. Speed values varied between 350 km/s and 400 km/s. The interplanetary magnetic field values were mostly stable around 7 nT until 08:00 UTC on December 09 when they increased up to 9 nT, due to a possible ICME arrival. The Bz component varied between 0 nT and -5 nT. The interplanetary magnetic field angle was mostly in the negative sector. Enhanced solar wind conditions are possible over the next 24 hours due to the ongoing ICME influence

Geomagnetism

Geomagnetic conditions globally and locally were mostly at quiet levels (NOAA Kp 1 to 2, K BEL 1 to 2). Quiet to active conditions (NOAA Kp 1 to 4), with a small chance of minor storm conditions due to the ongoing ICME influence, are expected over the next 24 hours.

Proton flux levels

Over the past 24 hours, the greater than 10 MeV GOES proton flux was enhanced but remained below the 10 pfu threshold. The 10 MeV GOES proton flux is expected to remain so over the next days, with chances for further enhancements.

Electron fluxes at geostationary orbit

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

Today's estimated international sunspot number (ISN): 157, based on 09 stations.

Solar indices for 08 Dec 2025

Wolf number Catania	///
10cm solar flux	186
AK Chambon La Forêt	003
AK Wingst	001
Estimated Ap	001
Estimated international sunspot number	165 - Based on 09 stations

Noticeable events summary

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

All times in UTC

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