SIDC -- Solar Influences Data Analysis Center

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

CACTus

2026-01-12 05:48 242km/s

Solar Map

Latest Alerts

None

No alerts since: 2026-01-13

Forecasts

Flare:
Protons:
Geomagnetic:
All quiet: False
Provisional SSN: 135

Solar Activity

URSIgram

Solar Wind

URSIgram

Research

Publications

ASPIICS/PROBA-3 formation-flying coronagraph: ground calibration at the Turin OPSys space lab
Fineschi, & al., 2025
Image calibration between the Extreme Ultraviolet Imagers on Solar Orbiter and the Solar Dynamics Observatory
Schirninger, & al., 2025
Estimating uncertainties in the back-mapping of the fast solar wind
Koukras, & al., 2025
Quasi-Periodic Pulsations in EUV Brightenings
Lim, & al., 2025
A high fraction of close massive binary stars at low metallicity
Sana, & al., 2025

A sunspot oddity

Something not seen very often: a bipolar sunspot region with both main portions having the same magnetic polarity.

First Proba-3 ASPIICS Guest Investigator Call

The first Proba-3 ASPIICS Guest Investigator call is now open, with a submission deadline of 12 February 2026. The GI programme offers access to Proba-3 ASPIICS data and the unique chance to participate in instrument commanding.

Sunspot numbers

Sunspot activity was quite variable during December 2025, with some large and complex sunspot regions at the beginning and end of the month.

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.

To avoid the disturbing or blocking effect of the Earth atmosphere, EUV observations of the solar corona need to be made from space...

We monitor and forecast solar variability to provide information services to society and industry about the influence of space weather and climate.

Data processing is necessary to extract relevant information for research studies, whereas data distribution and visualization are part of ROB open data policy.

Modelling of Solar phenomena allows scientists to test theories and to predict Space Weather phenomena and their impact on Earth.

The SIDC shares and expands its expertise through interaction with both upcoming and experienced researchers.