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 Sun produced no flares in the past 24 hours. The probability for a C
flare in the next 24 hours is estimated at 25%, mostly from returning NOAA
region 2682 which is approaching the East limb. No Earth-directed Coronal
Mass Ejections (CMEs) were observed in available coronagraphic imagery. The
greater than 10 MeV proton flux was at nominal levels.
Solar wind speed measured by DSCOVR varied between about 340 and 400 km/s
in the past 24 hours. The Interplanetary Magnetic Field (IMF) was
predominantlty directed away from the Sun and its magnitude ranged between
about 2 and 10 nT. Bz was predominantly negative, but there were no
extended intervals with Bz below -5 nT. Quiet to unsettled geomagnetic
conditions (K Dourbes between 1 and 3; NOAA Kp between 0 and 3) were
registered in the past 24 hours. Quiet to unsettled geomagnetic levels are
expected on October 19, 20 and 21.

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 Oct 13 2112 UTC
Due to the expected growth of the solar wind speed till 670 km/s (actual [more]

2017 Oct 11 0614 UTC
END OF ALL QUIET ALERT ...................... The SIDC [more]

2017 Sep 17 1959 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]

Science Highlights

Oct 19, 2017: Something's brewing...

Oct 16, 2017: The best of... 2016!

Oct 11, 2017: The Sun is spotless again!

Oct 04, 2017: A new LYRA product

Oct 04, 2017: Facing the Sun

click here for all science highlights


Sep 28, 2017: Recurrent Coronal Hole

Aug 11, 2017: Eclipse fever

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

Click here for all the press releases

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