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Observations

Space Based Imaging

More data: SWAP, EUI

Ground Based Imaging

More: H-α, WL, Ca-IIK, Drawings

Ground Based Radio

More: ARCAS+HSRS, CALLISTO

Space Based Timelines

More data: LYRA, TSI

WDC Sunspot Index

More data: SILSO

Space Weather Services

Detections

Solar Map

Latest Alerts

Presto 2025-10-04

A slow, partial halo Coronal Mass Ejection (SIDC CME 571) was detected in LASCO/C2 and LASCO/C3 coronagraph imagery, lifting off the east limb starting from around 18:30 UTC on October 03. A possible association is a filament eruption in the northeast quadrant, observed in AIA 304 data around 16:00 UTC on October 03. Preliminary analysis suggests a speed slower than 200 km/s and a small chance for a glancing blow arrival starting from the UTC evening on October 08. Further analysis of the event is ongoing.

CACTus Halo 2025-10-06

A halo or partial-halo CME was detected with the following characteristics: t0 | dt0| pa | da | v | dv | minv| maxv| 2025-10-03T16:48:07.896 | 6.999722222222222 | 99 | 156 | 156 | 38 | 103 | 276 t0: onset time, earliest indication of liftoff dt0: duration of liftoff (hours) pa: principal angle, counterclockwise from North (degrees) da: angular width of the CME (degrees), v: median velocity (km/s) dv: variation (1 sigma) of velocity over the width of the CME mindv: lowest velocity detected within the CME maxdv: highest velocity detected within the CME

Forecasts

  • Flare: C-class flares
    (≥50%)
  • Protons: Quiet
  • Geomagnetic: Quiet
    (A<20 and K<4)
  • All quiet: False
  • Provisional SSN: 125

Solar Activity

URSIgram 2025-10-07

Solar flaring activity was low over the past 24 hours, with only C-class flares identified. SIDC Sunspot Group 652 (NOAA Active Region [AR] 4233, Alpha magnetic configuration) and SIDC Sunspot Group 653 (NOAA AR 4232, Beta magnetic configuration) produced two flares each. The brightest flare of the last 24 hours was SIDC flare 5689, a C5 on 7 Oct at 11:29 UTC, and is associated with SIDC Sunspot Group 657 (NOAA AR 4236, Beta-Gamma magnetic configuration). More C-class flaring activity is expected in the next 24 hours. No Earth-directed Coronal Mass Ejections (CME) were observed in the last 24 hours. The greater than 10 MeV proton flux, as measured by the GOES-19 satellite, was at background levels over the past 24 hours and is likely to remain so in the next 24 hours. The greater than 2 MeV electron flux as measured by GOES 19 was well above the 1000 pfu threshold during the past 24 hours, with a peak value at 16000 pfu. Although it features a gradual decline, it is expected to remain above the 1000 pfu threshold during the next 24 hours. The 24-hour electron fluence is at high levels since 4 Oct 23:10 UTC but also featured a gradual decline. It is expected to drop to moderate levels within the next 24 hours.

Solar Wind

URSIgram 2025-10-07

During the last 24 hours geomagnetic conditions were both globally and locally quiet to unsettled (NOAA Kp 2- to 3 and K BEL 2 to 3). They are expected to remain at the same level, both globally and locally, for the next 24 hours. The Solar Wind (SW) conditions feature a slow SW regime during the past 24 hours. The SW speed ranged from 370 to 480 km/s, while the interplanetary magnetic field (B) varied between 4 and 10 nT, and its North-South component (Bz) fluctuated between -8 and 6 nT. A similar pattern is expected for the next 24 hours.

Research

News

CH01Oct2025

Coronal holes do it again!

The combined high-speed solar wind stream from 2 coronal holes affected the earth environment from 30 September onwards.
millionth EUI picture is a fact

The EUI team has become millionaires!

September 2025. The space instrument EUI onboard the spacecraft Solar Orbiter, took its millionth solar picture. Congratulations!
SO_PHI

Deceptive

On the confusing appearance of sunspot region NOAA 4216 (SIDC 621).
 

Activities

Ground Observations

The SIDC monitors the level of solar activity from the photosphere to the corona with ground based instruments located in Uccle and Humain.

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Space Instruments

To avoid the disturbing or blocking effect of the Earth atmosphere, EUV observations of the solar corona need to be made from space...

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Space Weather & Climate

We monitor and forecast solar variability to provide information services  to society and industry about the influence of space weather and climate.

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Data Processing & Distribution

Data processing is necessary to extract relevant information for research studies, whereas data distribution and visualization are part of ROB open data policy.

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Modeling

Modelling of Solar phenomena allows scientists to test theories and to predict Space Weather phenomena and their impact on Earth.

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Supporting Research

The SIDC shares and expands its expertise through interaction with both upcoming and experienced researchers.

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