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 returned to B-class eruptive
level. There have been seven B-flares flares originated at NOAA AR 2645
(McIntosh:Dai; Mag.Type:Betta-Gamma).The biggest flare B4.5 peaked today
(29-Mar-2017) at 01.40 UT originated at NOAA AR 2646 (McIntosh:Axx;
Mag.Type:Alpha) which is about to rotate over the east limb. No
Earth-directed CMEs have been detected over the past 24 hours. Solar
protons have remained at background levels over the past 24 hours. Solar
X-Ray background level is expected to remain low. NOAA AR 2645 is expected
to produce more B-class flares over the next 24 hours. C-class flares are
also not excluded.
Over the past 24 hours, solar wind speed measured by DSCOVR remained stable
with the average value around 700 km/s till 06:00 UT today (29-Mar-2017).
Then the speed dropped abruptly till 630 km/s. WSA-ENLIL model indicates
the Earth is out of influence of the high speed stream. Interplanetary
Magnetic Field (IMF) remained stable with the value around 4 nT. Bz
variations remained at low level (varying mostly between -4 nT and +4nT).
The geomagnetic field stayed at active conditions level  (K Dourbes between
2 and 4; NOAA Kp between 3 and 4). Active to unsettled geomagnetic
conditions (K Dourbes < = 4) are expected today and tomorrow.

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 27 1332 UTC
The arrival of the high speed stream (HSS) from the huge negative polarity [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 29, 2017: C-class flares at last!

Mar 27, 2017: A good catch

Mar 22, 2017: Sleeping Beauty

Feb 28, 2017: PROBA2 observed a solar eclipse

Feb 28, 2017: First GOES-16 solar images

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