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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 2024-02-17

A halo coronal mass ejection (CME) was observed in LASCO/C2 coronagraph data from 13:36 UTC on February 17th. The CME is associated to an eruption from behind the south-east limb. Based on the source location, no impact on Earth is expected.

CACTus Halo 2024-02-20

A halo or partial-halo CME was detected with the following characteristics: t0 | dt0| pa | da | v | dv | minv| maxv| 2024-02-16T01:36:35.480 | 4.0 | 153 | 164 | 631 | 198 | 102 | 931 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: C-class flares
  • Protons: Quiet
  • Geomagnetic: Quiet
    (A<20 and K<4)
  • All quiet: False
  • Provisional SSN:

Solar Activity

URSIgram 2024-02-21

Solar flaring activity over the past 24 hours was at low levels. The largest flare was a C4.4-flare, with peak time 02:17 UTC on February 21, associated with a yet unnumbered active region behind the east-limb on the southern hemisphere of the Sun. There are currently 3 numbered active regions on the visible disk. NOAA AR 3590 (beta-gamma) is the largest and most magnetically complex region but has only produced minor C-class flares in the last 24 hours. NOAA AR 3586 (beta) has been stable and inactive. NOAA AR 3584 has decreased in size and is rotating over the west limb. The solar flaring activity is likely to be at low levels over the coming days with C-class flares expected and M-class flares possible. No Earth directed Coronal Mass Ejections (CME)s, have been observed in the last 24 hours. Further analysis of the CME seen in LASCO C2 data one at 23:24 UTC on February 19, shows it is not expected to impact the Earth. Over the past 24 hours the greater than 10 MeV GOES proton flux continued to decrease and, although still slightly elevated, remained below the 10 pfu threshold. The proton flux is expected to continue to decrease over the next 24 hours. The greater than 2 MeV GOES 16 electron flux was below the 1000 pfu threshold and is expected to remain so in the upcoming days. The 24h electron fluence was at nominal level and is expected to remain so in the next days.

Solar Wind

URSIgram 2024-02-21

Geomagnetic conditions were globally and locally quiet (Kp 3 and K Bel 3) with some unsettled periods over the past 24 hours. Slow solar wind conditions were recorded over the past 24 hours. The solar wind speed as measured by ACE, gently declined from around 460 km/s to around 270 km/s. The interplanetary magnetic field fluctuated between 2 nT and 9 nT, with the Bz reaching a minimum value of -6 nT. The phi-angle was in the positive sector (directed away the Sun) with periods on the negative sector. In the next 24-hours slow solar wind conditions are expected.



A stunning eruption

A stunning double eruption took place near the northeast solar limb on 12 February.

An X-class flare for breakfast

NOAA 3576 unleashed a powerful X2.5 flare on 16 February at 06:53 UTC.

Solar flares in images

A view on some of the most prolific flaring events that took place during the week of 5-11 February.


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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