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.


Solar activity is low with only occasional B-class flares reported during
last 24 hours. We expect that solar activity will remain low with B-class
and isolated C-class flares possible in the coming hours.
The filament eruption, from the north-east quadrant of the Sun, observed at
about 02:00 UT this morning was associated with rather narrow CME, and the
bulk of the CME mass was directed mostly northward of the Sun-Earth line.
This CME will not arrive at the Earth.
No Earth directed CMEs have been observed and the solar protons remained at
background level in the past 24 hours.

The Earth is still inside the fast solar wind with the speed of about 720
km/s and the interplanetary magnetic field (IMF) magnitude of about 5nT.
During last 24 hours the IMF was stable with the value of about 5 nT, and
the Bz component of the IMF was fluctuating between -5 and +5 nT. 
Due to the fast solar wind and the occasional longer intervals of negative
value of the Bz component minor storm conditions were reported (Dourbes
reported K=5 and NOAA Kp=5) on April 23, at about 17 UT.
The geomagnetic conditions are presently unsettled to active and we expect
them to stay so in the coming hours. Due to the still rather fast solar
wind, longer intervals of the negative value of the Bz component might
cause the occasional intervals of minor storm conditions (with the K index
going up to 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 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