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.


The Sun did not produce any C flares in the past 24 hours. The chance for a
C flare in the next 24 hours is estimated at 15%. No Earth-directed Coronal
Mass Ejections (CMEs) were observed in available coronagraphic imagery. The
greater than 10 MeV proton flux was at nominal levels.
Solar wind speed measured by DSCOVR jumped from 337 to 352 km/s at 2:45 UT
on December 11, coinciding with a jump of the magnitude of the
Interplanetary Magnetic Field (IMF) and the solar wind density. Solar wind
speed has further increased to current values around 420 km/s. The IMF had
a maximum around 12 nT at 7:26 UT, with current values around 8 nT. This
enhanced solar wind is associated with the arrival of a high speed stream
from a positive coronal hole that crossed the central meridian on December
8. Quiet to unsettled geomagnetic conditions (K Dourbes between 1 and 3;
NOAA Kp between 0 and 3) were registered in the past 24 hours. Quiet to
minor storm levels (K Dourbes < 6) are possible on December 11, 12 and 13
due to the influence of the high speed stream associated with a positive
coronal hole, with a slight chance for moderate storm conditions (K Dourbes
= 6).

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 Dec 10 1925 UTC
END OF ALL QUIET ALERT ...................... The SIDC [more]

2017 Nov 14 0946 UTC
The in situ observations (from DSCOVR satellite), show sudden increase [more]

2017 Sep 17 1959 UTC
A halo or partial-halo CME was detected with the following characteristics: [more]

2017 Sep 10 1650 UTC
A class X8.9 solar X-ray flare occurred on 2017/09/10 with peak time 16:06UT [more]

Science Highlights

Dec 06, 2017: Reappearance

Nov 17, 2017: A New STAFF

Oct 19, 2017: Something's brewing...

Oct 16, 2017: The best of... 2016!

Oct 11, 2017: The Sun is spotless again!

click here for all science highlights


Nov 24, 2017: Fourteenth European Space Weather Week

Sep 28, 2017: Recurrent Coronal Hole

Aug 11, 2017: Eclipse fever

Click here for all the press releases

Good to know

PROBA2: Eighth Call for Guest Investigators

A Design 4 a Ticket

Breaking news