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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 2025-04-24

A shock was observed in the solar wind at L1, the interplanetary magnetic field jumped from 8 to 15 nT and the solar wind speed from 460 to 640 km/s. The driver of the shock may be a CME that left the Sun on 22 April at 08:12 UT from SIDC Sunspot Group 476 (NOAA Active Region 4065), and is currently passing south of the Earth. Geomagnetic conditions may reach active levels (K up to 4).

Forecasts

  • Flare: C-class flares
    (≥50%)
  • Protons: Quiet
  • Geomagnetic: Active conditions
    (A>=20 or K=4)
  • All quiet: False
  • Provisional SSN: 113

Solar Activity

URSIgram 2025-04-27

Solar flaring activity was low over the past 24 hours, only minor C-class flaring was observed. A total of 15 numbered sunspot groups were identified on the disk over the past 24 hours, all with simple alpha or beta magnetic field configuration, and most of them are decaying. The largest flare was a C1.3 one from SIDC Sunspot Group 468 currently located at S15E87, with beta magnetic field confuration. Solar flaring activity is expected to be low over the next 24 hours, with C-class flares expected. A wide CME erupted towards the north, first seen at 18:00 UTC on 26 April on LASCO C2, but is is not expected to arrive to the Earth. No Earth-directed CMEs were observed in the available coronagraph imagery in the last 24 hours. There is a large positive polarity coronal hole (SIDC Coronal Hole 104) in the southern hemisphere, although parts of it have rotated out of view over the west limb. In the northern hemisphere, there is one smaller, positive polarity coronal hole, that crossed the central meridian on 24 April. On the eastern part of the Sun, there is a recurrent transequatorial elongated negative polarity coronal hole, SIDC Coronal Hole 99. The greater than 10 MeV proton flux was below the threshold level over the past 24 hours. It is expected to remain below the threshold level over the next 24 hours. The greater than 2 MeV electron flux measured by GOES 18 and 19has been at, or slightly below, the threshold over the past 24 hours. The greater than 2 MeV electron flux may increase over the next 24 hours.The 24-hour electron fluence is presently between normal and moderate levels, it may increase over the next 24 hours.

Solar Wind

URSIgram 2025-04-27

Geomagnetic conditions have been quiet globally and locally (Kp and K_Bel up to 2). The possible arrival of a high speed solar wind stream may increase conditions to active levels. Otherwise, mostly quiet conditions can be expected. The solar wind speed has been gradually decreasing to around 400 km/s in the last 24 hours, with an interplanetary magnetic field of 5-10 nT, and Bz mostly positive. In the next 24 hours we may see the arrival of a high speed stream if the solar wind from the positive polarity coronal holes in the southern and/or in the northern hemisphere arrive to the Earth.

Research

News

ESWW CD9

Communicating Science Through Aurora

You're kindly invited to submit abstracts for the E-SWAN session titled "Communicating Science Through Aurora: Engaging the Public in Space Weather" at the upcoming ESWW 2025.
CH EUV

Mom, that large coronal hole is back!...

The earth environment is currently under the influence of a solar wind stream associated with a huge coronal hole.
A group of people posing for a photo

Solar Orbiter Workshop at the SIDC

On 8, 9 and 10 April 2025, the SIDC welcomed 85 leading solar physicists, in person and online, to participate in an international workshop on the future of the ESA/NASA Solar Orbiter mission.

 

 

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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