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.


In the past 24 hours, no C flares were observed. Very low solar activity
(no C flares) is expected in the next 24 hours.
Over the past 24 hours, solar wind speed measured by DSCOVR decreased from
about 570 to 495 km/s, while the magnitude of the Interplanetary Magnetic
Field (IMF) ranged between about 1 and 5 nT. This is indicative of a
transition to nominal solar wind conditions after the passage of the high
speed stream from a positive coronal hole. Quiet geomagnetic conditions (K
Dourbes between 1 and 2; NOAA Kp between 0 and 2) were registered in the
past 24 hours. Quiet to unsettled geomagnetic conditions (K Dourbes < 4)
are expected on March 25 and 26. The arrival of a high speed stream from a
large, recurrent coronal hole is expected on March 27. Consequently, active
geomagnetic conditions (K Dourbes = 4) are possible, with a chance for
minor geomagnetic storm intervals (K Dourbes = 5).

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 Mar 14 1101 UTC
A partial halo CME is visible in SoHO/LASCO C2 images from 20:00 UT onwards [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

Mar 22, 2017: Sleeping Beauty

Feb 28, 2017: PROBA2 observed a solar eclipse

Feb 28, 2017: First GOES-16 solar images

Feb 28, 2017: EUI getting ready!...

Feb 23, 2017: A stretched coronal hole

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