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 low. No significant flares
have been recorded. No Earth directed Coronal Mass Ejections (CMEs) have
been detected. AR 2664  (Mcintosh class:Hsx; Mag. type:Alpha) has produced
little activity. Thereís a small centrally located filament channel which
looks stable, and a small northern coronal hole extending to lower
latitudes that has moved into the Western hemisphere and may increase solar
wind speeds in a couple of days. Solar activity is expected to remain low
over the next 24 hours with a low probability of C-class flares and a very
low probability of M-class flares.

The solar wind speed has fluctuated around 320 km/s over the past 24 hours.
The total magnetic field strength has fluctuated between 3 and 8 nT. The Bz
component fluctuated around 0 nT, but has been mainly positive. Geomagnetic
conditions ranged between Kp index 1-3 (NOAA) and local K index 0-3
(Dourbes) over the past 24 hours. Geomagnetic conditions are expected to be

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 Jun 19 1130 UTC
In response to the recently issued PRESTO (issued on 2017-Jun-19 at 10:50 [more]

2017 Jun 17 1201 UTC
END OF ALL QUIET ALERT ...................... The SIDC [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]

Science Highlights

Jun 21, 2017: A day on the Sun

Apr 26, 2017: Works in progress!...

Apr 20, 2017: Impressive solar eruption

Apr 11, 2017: Airplane transits the Sun!

Apr 05, 2017: M-class flares à volonté!

click here for all science highlights


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

May 28, 2017: A coronal mass ejection as the source of a strong geomagnetic storm (NL-FR-EN)

Oct 26, 2016: High-speed solar wind causes major geomagnetic storm (NL-FR-EN)

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