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 been quiet. No significant flares
have been recorded. All Active Regions (AR) have shown low levels of
activity. No Earth directed Coronal Mass Ejections (CMEs) have been
detected. The greater than 10MeV proton flux remained at background levels
over the past 24 hours. Solar activity is expected to remain low over the
next 24 hours with a low probability of C-class flares.

The solar wind speed been increasing from 300 and 600 km/s over the past 24
hours. The total magnetic field strength has fluctuated between 4 nT and 14
nT. The Bz component has fluctuated between positive and negative,
fluctuating between -13 and +14 nT. Geomagnetic conditions ranged between
Kp index 1-4 (NOAA) and local K index 1-4 (Dourbes) over the past 24 hours.
A positive polar coronal hole is currently positioned in the Western
hemisphere of the Sun and the resulting high-speed stream (HSS) has
enhanced solar wind speeds and as a consequence increased geo-activity
levels. Geomagnetic conditions are expected to remain unsettled throughout
the day, but should begin to return to quiet conditions at the end of the

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

2017 Nov 07 0756 UTC
END OF ALL QUIET ALERT ...................... The SIDC [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

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!

Oct 04, 2017: A new LYRA product

click here for all science highlights


Sep 28, 2017: Recurrent Coronal Hole

Aug 11, 2017: Eclipse fever

Jun 02, 2017: Extreme Ultraviolet Imager (EUI) ready for launch!

Click here for all the press releases

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