Vaata reede, 27 detsember 2024 arhiivi

Daily bulletin on solar and geomagnetic activity from the SIDC

Välja antud: 2024 Dec 27 1237 UTC

SIDC Forecast

Päikesepursked ehk loited

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

Geomagnetism

Quiet (A<20 and K<4)

Päikese prootonid

Quiet

	10cm flux	Ap
27 Dec 2024	260	007
28 Dec 2024	260	007
29 Dec 2024	260	007

Solar Active Regions and flaring

Solar flaring activity was low to moderate over the past 24 hours, with several C-class flares observed, including three C9 flares. A total of 12 numbered sunspot groups were identified on the solar disk during this period. The largest flare was a C9.6 flare (SIDC Flare 3090), which peaked on December 26 at 18:45 UTC. This flare was produced by a newly identified sunspot, SIDC Sunspot Group 352, which also produced a C6.7 flare peaking on December 27 at 05:42 UTC. SIDC Sunspot Group 350 (NOAA Active Region 3938), currently located at N21E40, remains the most complex and active region on the disk, exhibiting a Beta-Gamma-Delta magnetic configuration. This region produced multiple C-class flares, including a C9.0 flare that peaked on December 27 at 00:50 UTC. SIDC Sunspot Group 341 (NOAA Active Region 3932), now positioned at S17W08, also remains complex with a Beta-Gamma-Delta magnetic configuration. This region produced the second-largest flare, a C9.5 flare peaking on December 27 at 08:05 UTC, along with additional C-class flares. Solar flaring activity is expected to remain low to moderate over the next 24 hours, with a high likelihood of C-class flares, a possibility of M-class flares, and a small chance of X-class flares.

Krooniaine massiline väljavool

Over the past 24 hours, multiple coronal mass ejections (CMEs) were observed in SOHO/LASCO-C2 imagery, including two partial halo CMEs directed toward the southeast. The first CME was observed on December 27, 2024, at 05:24 UTC, with a projected speed estimated by CACTus at an average of 517 km/s (minimum 351 km/s, maximum 769 km/s). The second CME was observed earlier on December 27, 2024, at 04:28 UTC, with a projected speed estimated by CACTus at an average of 991 km/s (minimum 201 km/s, maximum 1782 km/s). The source regions for both CMEs remain unclear. No significant flares or dimming events have been observed on the visible solar disk that could be conclusively linked to these CMEs. At this point, it is presumed that the CMEs may have originated from the far side of the Sun. Further analysis is required to determine their trajectories, and updates will be provided as additional data becomes available.

Krooniauk

SIDC Coronal Hole 83, an equatorial coronal hole with negative polarity that crossed the central meridian on December 19, has now rotated over the western limb, while the SIDC Coronal Hole 84, a mid- latitude coronal hole in the northern hemisphere with positive polarity, first crossed the central meridian on December 23 and is now also positioned on the western side of the Sun.

Päikesetuul

The solar wind at Earth remains in a slow-speed regime, with values ranging between 326 km/s and 400 km/s. The total interplanetary magnetic field is stable below 5 nT, with its southward component fluctuating between -3.7 nT and 3.9 nT. This slow-speed solar wind is expected to persist. However, due to heightened solar activity, including multiple intense flares and coronal mass ejections from magnetically complex sunspot groups, the possibility of a glancing blow causing temporary disturbances in solar wind conditions cannot be ruled out.

Geomagnetism

Geomagnetic conditions over the past 24 hours were very quiet globally (NOAA Kp: 0 to 1) and quiet locally over Belgium (K-Bel: 0 to 2). However, given the heightened solar activity, including multiple intense flares and coronal mass ejections originating from magnetically complex sunspot groups, the possibility of a glancing blow or other solar wind structures temporarily disturbing the conditions cannot be excluded. This may result in short periods of active conditions or even minor geomagnetic storms.

Proton flux levels

The greater-than-10 MeV GOES proton flux continues its gradual decrease and has now reached background levels. However, a small chance of a proton event crossing the threshold within the next 24 hours cannot be fully ruled out, given the heightened solar activity with multiple intense flares and coronal mass ejections originating from magnetically complex sunspot groups.

Electron fluxes at geostationary orbit

The greater-than-2 MeV electron flux measured by GOES 18 remained below the threshold level over the past 24 hours, while it briefly reached the threshold level in GOES 16. It is expected to remain below the threshold over the next 24 hours. The 24-hour electron fluence is currently at normal levels and is anticipated to stay at normal levels over the next 24 hours.

Today's estimated international sunspot number (ISN): 257, based on 07 stations.

Solar indices for 26 Dec 2024

Wolf number Catania	///
10cm solar flux	256
AK Chambon La Forêt	007
AK Wingst	002
Estimated Ap	001
Estimated international sunspot number	267 - Based on 09 stations

Noticeable events summary

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

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