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 solar activity has been quiet over the past 24 hours with X-ray flux
remaining below C level. Catania sunspot group 86 and 87 (NOAA active
region 2713 and 2714) remained stable and produced only small B-class
flares. A new sunspot (Catania sunspot group 88, NOAA active region 2715)
has recently emerged and produced only a small B-class flare. Flaring
conditions are expected to remain quiet for the next 24-hour period with a
small chance of C-class flare.

No Earth directed Coronal Mass Ejection has been observed. The greater than
10 MeV solar protons flux remained at nominal levels over the past 24 hours
and is expected to remain so.

The Earth remained under the influence of the solar wind associated with
the coronal hole, which passed the central meridian on Jun 15. The wind
speed values fluctuated between 480 to 520 km/s, and is currently
decreasing to reach 428 km/s. The interplanetary magnetic field is at its
nominal condition with the total magnetic field strength below 5 nT and the
southward component fluctuating between -3.5 and +4.5 nT. Solar wind
conditions are expected to return to the slow regime within the next two
days. A north pole coronal hole of positive polarity and extending to
latitude 25 deg. is currently passing through the central meridian. The
associated fast solar wind would reach Earth on the 23rd of June.

Geomagnetic conditions have been mostly quiet over the past 24 hours. The
Kp index (NOAA) ranged between 1-2 and local K index 0-3 (Dourbes). The
geomagnetic conditions are expected to remained quiet for the next period.

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 Jun 20 1252 UTC
START OF ALL QUIET ALERT ........................ The SIDC - RWC Belgium [more]

2018 May 06 0934 UTC
Geomagnetic activity has reached moderate storm levels with an episode [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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