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.


NOAA 2603 remained the sole sunspot region currently visible on the solar
disk. It developed some additional sunspots in its trailing portion and was
the source of a B2.0 flare peaking at 01:05UT, the strongest event of the
period. Some filament and prominence eruptions were observed over the last
24 hours, but the associated coronal mass ejections (CMEs) had no
earth-directed component. 

Quiet flaring conditions are expected to continue, with a small chance on
an isolated C-class flare.

The anticipated co-rotating interaction region (CIR) preceding the high
speed stream (HSS) from the huge coronal hole (CH) arrived around 08UT and
was quickly followed by a steep increase of the solar wind speed from its
pre-CIR range between 380 and 420 km/s to its current value around 630 km/s
(DSCOVR data). Bz, which was mostly negative over the last 24 hours,
started strong fluctuations between -18 and +10 nT from about 10UT onwards.
The interplanetary magnetic field (IMF) was mostly directed away from the
Sun (positive). Quiet to active geomagnetic conditions were recorded, with
Kp at minor storming during the 03-06UT and 09-12UT interval.    
Over the next 24-48 hours, wind speeds are expected to increase to well
over 700 km/s, with Bz continuing to make occasional strong negative
excursions. Active to moderate storm conditions are expected, a major
storming interval (K-index = 7) not excluded.

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 Oct 25 1650 UTC
As expected, the arrival of the co-rotating interaction region (CIR) and [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

Oct 19, 2016: Sunspot gets a facelift

Oct 03, 2016: So long, filament!

Sep 28, 2016: Return of the Behemoth

Sep 20, 2016: Farside eruption

Sep 12, 2016: Collateral damage

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

ASGARD: balloons for science

Medals in Space Weather

Another Eclipse seen by PROBA2