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 visible side of the Sun is presently spotless and consequently there
was no flaring activity reported during last 24 hours. We expect such a low
flaring activity to persist in the coming hours. No Earth directed CMEs
were observed, and the solar protons remained at the background level.

The solar wind speed is slowly decreasing and it presently amounts about
480 km/s. The interplanetary magnetic field magnitude is about 4 nT. The
low latitudinal extension of the northern polar coronal hole has reached
the central meridian this morning. The possible arrival of the associated
fast solar wind might be expected at the Earth late on September 21 or in
the morning of September 22.
During last 24 hours the geomagnetic conditions were quiet to unsettled and
we expect them to stay so in the coming hours.

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

2018 Sep 11 1017 UTC
Geomagnetic conditions have reached moderate storm levels on a planetary [more]

2018 Aug 18 1222 UTC
END OF ALL QUIET ALERT ...................... The SIDC [more]

2018 May 04 1644 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]

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