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Space Based Imaging

More data: SWAP, EUI

Ground Based Imaging

More: H-α, WL, Ca-IIK, Drawings

Ground Based Radio


Space Based Timelines

More data: LYRA, TSI

WDC Sunspot Index

More data: SILSO

Space Weather Services


Solar Map

Latest Alerts


No alerts since: 2023-05-30


  • Flare: M-class flares
  • Protons: Quiet
  • Geomagnetic: Quiet
    (A<20 and K<4)
  • All quiet: False
  • Provisional SSN: 136

Solar Activity

URSIgram 2023-06-04

There are seven visible active regions on the solar disk. Only C-class flaring has been observed in the last 24 hours, from NOAA ARs 3319, 3323 and a new active region rotating into view over the east limb. The strongest flare was a C8.9 from NOAA AR 3323, peaking at 03:49 UTC. In the next 24 hours, more C-class flares will be observed and M-class flares are possible. No Earth-directed coronal mass ejections (CMEs) were detected in the past 24 hours. Over the past 24 hours the greater than 10 MeV GOES proton flux was at nominal levels and is expected to remain so in the next 24 hours. The greater than 2 MeV electron flux was below the 1000 pfu threshold over the past 24 hours and is expected to remain so in the next 24 hours. The 24h electron fluence was at normal levels and is expected to remain at normal levels over the next 24 hours.

Solar Wind

URSIgram 2023-06-04

The geomagnetic conditions over the past 24 hours have been quiet to moderate (K_Belgium and Kp up to 3). Similar conditions can be expected for the next 24 hours. In the last 24 hours the solar wind speed has been low, it is now around 320 km/s with an interplanetary magnetic field of about 7nT. Similar conditions can be expected for the next 24 hours.



USET observes sunspots by eye

There was quite the excitement in USET team last week. Not one, but two sunspot regions were visible with the naked eye!

An M class flare observed with ROB ground based observatories

Ground based optical and radio solar instruments from ROB monitor together the recent period of increased solar activity

EUI can observe both elephants and mice among solar eruptions

The EUI telescope on Solar Orbiter was able to catch the miniature version of solar flares and mass ejections. Thanks to sharp and fast imaging of the EUI telescope, researchers could observe magnetic reconnection taking place repeatedly on very small scales.


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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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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