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.
Aug 18, 2015: The Sunspot Number, the "longest ongoing scientific experiment" revisited


Solar activity has been very low, no C-class flares in past 24 h. All the
active regions on the visible solar disk have simple configuration, only
C-class flares can be expected.
Geomagnetic conditions are quiet and expected to remain so until the
arrival of the fast speed stream from a small equatorial coronal hole
within 48 h. The solar wind speed is currently at 350 km/s with
interplanetary magnetic field intensity of 5 nT.

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

2015 Aug 27 0934 UTC
While solar wind speeds are at or around background levels (360-390 km/s), [more]

2015 Aug 24 0806 UTC
A class M5.6 solar X-ray flare occurred on 2015/08/24 with peak time 07:33UT [more]

2015 Aug 13 1049 UTC
A halo or partial-halo CME was detected with the following characteristics: [more]

2015 Jun 02 0746 UTC
END OF ALL QUIET ALERT ...................... The SIDC [more]

Science Highlights

Aug 05, 2015: Holy loopiness!

Jul 29, 2015: STEREO-A's reawakening

Jul 23, 2015: A complex filament eruption

Jul 16, 2015: Coincidence

Jul 08, 2015: The solar cycle's new clothes

click here for all science highlights


Aug 18, 2015: The Sunspot Number, the "longest ongoing scientific experiment" revisited

Aug 11, 2015: The Perseids - don't miss it

Jul 01, 2015: Switching to the new Sunspot Number

Click here for all the press releases

Good to know

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