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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 2026-04-18

Geomagnetic conditions have reached moderate storm levels at planetary scale with Kp up to 6- (in the period from 6:00 to 9:00 UT), and minor storm levels locally with K_Bel up to 5. This is due to the arrival of the fast solar wind stream from SIDC Coronal Hole 147. The solar wind speed rose to 550 km/s, the interplanetary magnetic field magnitude has reached 17 nT with Bz down to -14 nT. This is a large coronal hole located that has increased in size since the last rotation, we can expect high speeds probably reaching 700 km/s in the coming hours. More disturbed periods are expected in the next 24 hours (up to moderate storm levels).

Forecasts

  • Flare: C-class flares
    (≥50%)
  • Protons: Quiet
  • Geomagnetic: Active conditions
    (A>=20 or K=4)
  • All quiet: False
  • Provisional SSN:

Solar Activity

URSIgram 2026-04-20

Solar flaring activity was very low over the past 24 hours. The X-ray flux was below C level. A total of 2 numbered sunspot groups were identified on the disk over the past 24 hours. SIDC Sunspot Group 825 (NOAA Active Region 4419) is the largest and most magnetically complex (Beta-Gamma) regions on disk. Solar flaring activity is expected to be low over the next 24 hours, with C-class flares likely and a small chance for M-class flares. A Coronal Mass Ejection (CME) was observed erupting towards the north-east, in LASCO-C2 data around 16:00 UTC on April 19. This CME is associated with a filament eruption seen in SDO/AIA 304 in around 15:15 UTC on April 19, with an estimated speed of 378 km/s. Analysis of this CME is ongoing. The greater than 10 MeV GOES proton flux was at background levels and is expected to remain at background levels over the next 24 hours. The greater than 2 MeV electron flux, as measured by GOES-18 and GOES-19 was above the 1000 pfu alert threshold in the past 24 hours. The flux is expected to fluctuate around the alert threshold over the next 24 hours. The greater than 2 MeV electron flux, as measured by GOES-18 and GOES-19 was above the 1000 pfu alert threshold in the past 24 hours. The flux is expected to fluctuate around the alert threshold over the next 24 hours.

Solar Wind

URSIgram 2026-04-20

The geomagnetic conditions reached active condition globally (Kp 4) and unsettled conditions locally (K BEL 3) in the last 24 hours. Active conditions are expected over the next 24 hours. Over the past 24 hours the solar wind parameters were under the waning influence of a high-speed stream associated with SIDC Coronal Hole 147. The solar wind speed ranged between 406 km/s to 522 km /s. The total interplanetary magnetic field ranged from 2 to 10 nT, with the Bz reaching a minimum of -8 nT. The phi-angle was mainly in the negative sector (directed towards the Sun), with periods in the positive sector. In the next 24 hours solar wind conditions are expected to remain enhanced.

Research

News

The (artificially coloured) yellow part of the video shows the Sun in ultraviolet light, recorded by the SWAP telescope on ESA's Proba-2 spacecraft. The greyscale area around it is based on data captured in visible light by the ASPIICS coronagraph on Proba-3.

A New View of the Sun’s Corona

The Belgian-led ASPIICS coronagraph aboard ESA’s Proba-3 mission reveals a dynamic birthplace of the solar wind. Observations made by the ASPIICS coronagraph reveal a world of small-scale activity in the Sun’s inner corona, according to a new study led by the Royal Observatory of Belgium.
ComboCMEX1

A wimp and a bully

Two earth-directed coronal mass ejections surprised space weather forecasters with their arrival time and geomagnetic impact. The first one passed almost unnoticeable, the second one eventually resulted in a strong geomagnetic storm.
X1_AIA131

X-class flare!

NOAA 4405 produced an X-class flare early on 30 March. The associated CME arrived around noon on 1 April. There's no chance on aurora over Belgium tonight. ***(UPDATED 2)***
 

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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