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.


Solar activity was at very low levels, and is expected to remain so. The
solar disk was spotless. No earth-directed coronal mass ejections (CMEs)
were observed in available coronagraphic imagery. The greater than 10 MeV
proton flux remained slightly above background levels.

Earth is exiting the high speed stream (HSS) from a positive polarity
coronal hole (CH). Wind speed gradually decreased from 590 km/s to its
current values near 450 km/s (DSCOVR). Bz oscillated between -4 and +3 nT
until about 19UT, when it started a much smoother variation between -3 and
+2 nT. The interplanetary magnetic field was mostly directed away from the
The geomagnetic field was at quiet levels. Mostly quiet geomagnetic
conditions are expected, with a chance on an unsettled episode.

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 Jul 23 1044 UTC
A halo or partial-halo CME was detected with the following characteristics: [more]

2017 Jul 23 1206 UTC
SoHO/LASCO C2 images show a full halo CME from 4:36UT onwards. STEREO [more]

2017 Jul 19 1216 UTC
START OF ALL QUIET ALERT ........................ The SIDC - RWC Belgium [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]

Science Highlights

Jul 27, 2017: NOAA 2665's fireworks continues!

Jul 19, 2017: The Bastille Day 2017 event

Jul 10, 2017: A Sunday morning solar observing session

Jul 04, 2017: An eruptive surprize

Jun 21, 2017: A day on the Sun

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)

Click here for all the press releases

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