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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

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Space Weather Services


Solar Map

Latest Alerts

Presto 2024-02-23

An X6.3 flare, with a peak time 22:34 UTC on February 22th, was produced by NOAA AR 3590. Currently no increase is observed in the GOES proton flux. Strong radio burst and highly disturbed radio communications have been observed related to this flaring activity.

Flaremail 2024-02-22

A class X1.7 solar X-ray flare occurred on 2024/02/22 with peak time 06:32UT

CACTus Halo 2024-02-22

A halo or partial-halo CME was detected with the following characteristics: t0 | dt0| pa | da | v | dv | minv| maxv| 2024-02-22T00:24:07.423 | 3.0 | 127 | 164 | 781 | 389 | 132 | 1644 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: Active conditions
    (A>=20 or K=4)
  • All quiet: False
  • Provisional SSN: 119

Solar Activity

URSIgram 2024-02-25

Solar flaring activity over the past 24 hours was at low levels. The largest flare was a C7.8-flare, with peak time 17:56 UTC on February 24 associated with NOAA AR 3590 (beta-gamma-delta). The second largest flare was C5.8-flare, with peak time 17:25 associated with NOAA AR 3592 (beta). There are currently 5 numbered active regions on the visible disk. NOAA AR 3590 (beta-gamma-delta) is the largest, most magnetically complex region and has produced most of the flaring activity in the last 24 hours. NOAA AR 3586 (alfa) has started to rotate over the west limb. A new yet unnumbered active region has started to emerge on the north-east quadrant of the visible Solar disk. All other regions were inactive and stable. The solar flaring activity is likely to be at moderate levels over the coming days with C-class flares expected and M-class flares possible and a chance for an X-class flare. A Coronal Mass Ejections (CME)s, was detected in LASCO C2 data at 17:00 UTC on February 24, it was mainly directed towards the east and is associated with a C5.8-flare, with peak time 17:25 associated with NOAA AR 3592. No impact from this CME is expected at Earth. Two negative polarity coronal holes have passed the central meridian. One in the northern half of the Sun at high latitude and the other in the Southern half at low latitude. The Southern coronal hole is currently in a geo-effective position. Over the past 24 hours the greater than 10 MeV GOES proton flux was at nominal levels and is expected to remain so over the next days. Some enhancements are possible in the case of an eruptive activity from NOAA AR 3590. 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 2024-02-25

Geomagnetic conditions globally and locally reached unsettled conditions (Kp 3 and K Bel 3). Unsettled to active conditions are expected in the next 24 hours. In the last 24 hours, the Earth came under the influence a high-speed stream associated with a negative polarity coronal hole, which crossed the central meridian on February 23 and became further perturbed because of the arrival of a ICME from February 21. A shock in the solar wind shows the arrival of the high-speed stream. The solar wind speed jumped from around 309 km/s to around 380 km/s and the interplanetary magnetic field jumped from 5 nT to 10 nT at 16:20 UTC on February 24. At around 00:40 UTC on February 25 the Earth came under the influence of a ICME after which the solar wind speed reached maximum values of around 450 km/s and the interplanetary magnetic field reached a value of 11 nT, with a minimum Bz value of -10 nT. Over the entire period the phi-angle was mainly in the negative sector (directed towards the Sun) with periods on the positive sector. In the next 24 hours, the solar wind conditions are expected to be disturbed under the influence of the high-speed-stream and ICME.



More X-class flares

NOAA 3590 produced 3 X-class flares in 24 hours: an X1.8 flare peaking late on 21 February, an X1.7 flare peaking early on 22 February, and an X6.3 event that peaked on 22 February at 22:34UTC. The latter is the strongest flare so far this solar cycle. ***UPDATED.***

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.


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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