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 is only one active region observed on the visible side of the solar
disc, NOAA AR 2597. Solar activity is low with one C-class flare reported
during last 24 hours. The C 1.3 flare which peaked at 19:14 on September 25
originated form NOAA AR 2597. We can expect isolated C-class flares in the
coming hours. No Earth directed CMEs were observed in the last 24 hours.
The solar wind speed is presently about 410 km/s. The interplanetary
magnetic field magnitude is about 10 nT, and the Bz component of the
interplanetary magnetic field is about -6 nT. Due to longer interval of the
negative value of the Bz component, disturbed geomagnetic conditions were
reported in the evening and around midnight of September 26 (local station
at Dourbes reported interval with K=5 and NOAA reported interval of 
The fast flow associated with the large, low latitude extension of the
northern polar coronal hole which crossed central meridian on mid-day of
September 25 is expected to arrive at the Earth in the late evening of
September 27 or early morning of September 28. We expect that arrival of
fast solar wind will induce disturbed geomagnetic conditions (up to Kp=6).
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

2016 Sep 20 0951 UTC
A moderate geomagnetic storm (Kp = 5) is currently ongoing, while K Dourbes [more]

2016 Sep 06 1458 UTC
The Halo CME alert issued by CACTus on 2016 Sep 06 1344 UTC was false. [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

Sep 20, 2016: Farside eruption

Sep 12, 2016: Collateral damage

Aug 30, 2016: Resuscitating STEREO-B

Aug 11, 2016: Sun-grazing comet mystery

Jul 26, 2016: A spectacular flare

click here for all science highlights


May 04, 2016: Mercury Transit

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

Jan 15, 2016: Space Technology & Calibration Laboratories

Click here for all the press releases

Good to know

Medals in Space Weather

Another Eclipse seen by PROBA2

Spark of Aurora