Welcome to the Solar Influences Data Analysis Center (SIDC), which is the solar physics research department of the Royal Observatory of Belgium. The SIDC includes the World Data Center for the sunspot index and the ISES Regional Warning Center Brussels for space weather forecasting.


Over the past 24 hours solar activity has been low. there were no
significant flares and all Active Regions (AR) have shown low levels of
activity. No Earth directed Coronal Mass Ejections (CMEs) have been
detected. Solar protons have remained at background levels over the past 24
hours. Solar activity is expected to remain low over the next 24 hours with
a low probability of C-class flares.
The solar wind speed has fluctuated between 370 and 410 km/s over the past
24 hours. The total magnetic field strength has remained around 4 nT. The
Bz component fluctuated around 1 nT, ranging between -2 and +4 nT.
Geomagnetic conditions ranged between Kp index 0-2 (NOAA) and local K index
0-3 (Dourbes) over the past 24 hours. Geomagnetic conditions are expected
to be quiet to unsettled over the next 24 hours. A small coronal hole
located at central latitudes has rotated into the Western hemisphere and
the resultant High Speed Stream (HSS) may enhance solar wind speeds in the
coming days.

Latest SWAP image

SWAP latest image

Latest USET H-alpha image
USET latest Halpha image

Latest LYRA curve

Latest LYRA Curves

Latest Callisto Observations

Latest HUMAIN Callisto qkl

Daily estimated sunspot number

Most recent alerts

2016 Oct 13 0929 UTC
Following the October 9 CME arrival, the persistent negative Bz component [more]

2016 Sep 06 1458 UTC
The Halo CME alert issued by CACTus on 2016 Sep 06 1344 UTC was false. [more]

2016 Jul 24 0516 UTC
A class M5.5 solar X-ray flare occurred on 2016/07/23 with peak time 05:31UT [more]

2016 Jul 05 2210 UTC
END OF ALL QUIET ALERT ...................... The SIDC [more]

Science Highlights

Oct 19, 2016: Sunspot gets a facelift

Oct 03, 2016: So long, filament!

Sep 28, 2016: Return of the Behemoth

Sep 20, 2016: Farside eruption

Sep 12, 2016: Collateral damage

click here for all science highlights


May 04, 2016: Mercury Transit

Mar 23, 2016: STCE 10 years - Happy Birthday!

Jan 15, 2016: Space Technology & Calibration Laboratories

Click here for all the press releases

Good to know

ASGARD: balloons for science

Medals in Space Weather

Another Eclipse seen by PROBA2