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 presently five small sunspot groups visible on the solar disc, as
reported by Catania. There were two B-class flares reported this morning,
originating from the newly emerged, Catania sunspot group 81 (NOAA AR
2628). We expect solar activity to remain on the low level, with B-class
and occasional C-class flares possible. No Earth directed CMEs were
observed during last 24 hours.
The Earth is still inside the fast solar wind, but the wind speed is slowly
decreasing and it presently amounts about 550 km/s. The interplanetary
magnetic field magnitude is about 4 nT. 
Due to the still ongoing influence of the fast solar wind, we can expect
unsettled conditions 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 Jan 17 2242 UTC
The faint and slow partial halo CME, first seen in the SOHO LASCO C2 field [more]

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

Jan 16, 2017: RoboSWOP in a space game EUFHORIA looking for sunspot treasures

Jan 05, 2017: Spotless Days page

Dec 22, 2016: The first sunspot of cycle 25 is seen!

Dec 05, 2016: PROBA2's 45 X-class flares

Nov 29, 2016: First radio burst for ARCAS

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

ESWW14 - call for sessions

Three Topical Issues for the SWSC Journal

The Sun in 2016