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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

Presto 2024-05-30

A partial halo coronal mass ejection (CME) was first observed in the LASCO/C2 chronograph imagery at 14:48 UTC May 29. The CME is mostly directed to the east and an has estimated projected velocity around 600 km/s and is related to the X1.4 flare with peak time 14:37 UTC, from NOAA AR 3397. Type II and Type IV radio emission were detected associated with this event. While the bulk of the ejecta is expected to miss Earth, preliminary analysis suggests that a glancing blow could possibly arrive at Earth late on May 31. Further analysis is ongoing to better determine the CME direction of propagation and expected impacts at Earth and will be reported in the daily bulletin.

Flaremail 2024-05-29

A class M5.7 solar X-ray flare occurred on 2024/05/29 with peak time 18:41UT

CACTus Halo 2024-05-30

A halo or partial-halo CME was detected with the following characteristics: t0 | dt0| pa | da | v | dv | minv| maxv| 2024-05-29T14:48:07.412 | 5.0 | 144 | 360 | 801 | 745 | 113 | 1953 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


  • Flare: M-class flares
  • Protons: Quiet
  • Geomagnetic: Quiet
    (A<20 and K<4)
  • All quiet: False
  • Provisional SSN: 163

Solar Activity

URSIgram 2024-05-29

Solar activity was moderate over the last 24 hours. The largest flare of the period was an M1.8 flare from Catania sunspot group 27 (NOAA AR 3695) with peak time 11:21 UTC. Further M-class flares, an M1.4 and M1.3, with peak times 06:45 UTC and 01:06 UTC on May 29, respectively were recorded from Catania sunspot group 28 (NOAA AR 3697). The other complex region on the disk, Catania sunspot group 22 (NOAA AR 3691), was stable and produced C-class flaring. The rest of the regions were quiet and either stable or in decay. The solar flaring activity is expected to be moderate over the next 24 hours with C-class flares expected, M-class flares likely and a low probability for further X-class flares. No Earth directed Coronal Mass Ejections (CMEs) have been detected in the available coronagraph imagery. Over the past 24 hours the greater than 10 MeV GOES proton flux was below the 10pfu threshold and is expected to remain so. There is a slight chance that the proton flux may increase due to strong flaring from NOAA ARs 3697 or 3691, but this is unlikely due to their current position. The greater than 2 MeV electron flux remained below the 1000 pfu threshold as measured by GOES 16. It is expected to remain below this threshold over the next days. The 24-hour electron fluence was at nominal levels. The electron fluence is expected remain at nominal levels over the next day.

Solar Wind

URSIgram 2024-05-29

Geomagnetic conditions were at quiet to unsettled levels (NOAA Kp 2 and Local K Bel 3). Geomagnetic conditions are expected to be mostly at quiet to unsettled levels on May 29 and 30. The solar wind conditions reflected a slow solar wind regime with speeds between 310 and 360 km/s. The interplanetary magnetic field was stable around 6nT before showing a small jump to 8nT around 05:00 UTC followed by a gradual increase to values around 10nT. The Bz component was mostly positive with a minimum value of -1 nT. Generally slow solar wind conditions are expected to continue on May 29 and 30.




GNSS impacts from the 10-11 May extreme storm

Important ionospheric effects over Europe have been observed during the extreme geomagnetic storm of 10 and 11 May.

Return of the King!

Returning old active region NOAA 3664 produced an X2.8 flare on 27 May. Updates on further activity from this region will be posted here. ***UPDATED (1)***

When the dust has settled...

Flare productivity from NOAA 13664 and the extreme geomagnetic storm on 10-11 May rank amongst the most impressive in the space weather domain. A perspective.


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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