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.


There are three active regions, all with the simple configuration of the
photospheric magnetic field, presently observed on the visible side of the
solar disc. Solar activity is low with five low B-class and no C-class
flares reported during last 24 hours. We do not expect change in the solar
activity, and although C-class flares are possible, they are not very
No Earth directed CMEs have been observed and the solar protons remained at
background level in the past 24 hours.

The solar wind speed is slowly decreasing and it presently amounts 600
km/s. The interplanetary magnetic field magnitude is about 5nT. Due to the
influence of the fast solar wind, several intervals of the active
conditions were reported during last 24 hours (Dourbes reported K=4 and
NOAA Kp=4). The geomagnetic conditions are presently unsettled to active
and we expect them to stay so in the coming hours. 

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

2017 Apr 22 0840 UTC
The high speed stream from the equatorial extension of the southern coronal [more]

2017 Apr 03 1504 UTC
A class M5.8 solar X-ray flare occurred on 2017/04/03 with peak time 14:29UT [more]

2016 Nov 05 1349 UTC
A halo or partial-halo CME was detected with the following characteristics: [more]

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

Science Highlights

Apr 20, 2017: Impressive solar eruption

Apr 11, 2017: Airplane transits the Sun!

Apr 05, 2017: M-class flares à volonté!

Mar 29, 2017: C-class flares at last!

Mar 27, 2017: A good catch

click here for all science highlights


Oct 26, 2016: High-speed solar wind causes major geomagnetic storm (NL-FR-EN)

May 04, 2016: Mercury Transit

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

Click here for all the press releases

Good to know


14th European Space Weather Week

Topical Issue for the SWSC Journal