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.


Over the past 24 hours solar activity has been low. No significant flares
have been recorded. NOAA Active Region (AR) 2660 has been most active,
producing two B-class flares. No Earth directed Coronal Mass Ejections
(CMEs) have been detected in coronagraph observations. The greater than
10MeV proton flux remained at background levels over the past 24 hours.
Solar activity is expected to remain low over the next 24 hours with a
small chance for C-class flares.
Solar wind speed decreased from about 475 km/s to values around 370 km/s.
The total interplanetary magnetic field (IMF) strength, as recorded by the
DSCOVR satellite, was around 3.5 nT. Bz fluctuated between -2 and +3 nT.
Geomagnetic conditions (K Dourbes between 0 and 3; NOAA Kp between 0 and 1)
were ranged from quiet to unsettled level in the past 24 hours. Solar wind
speed is expected to decrease even more today. In response geomagnetic
conditions are likely to experience mostly quiet to unsettled conditions
today (25-May-2017 April) and tomorrow (26-May-2017). Active conditions
with a small chance for minor geomagnetic storm are possible on the day
three (27-May-2017) due to possible arrival of 23-May 2017 coronal mass

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 May 24 1324 UTC
Slow partial halo CME, with projected speed of about 192 km/s and angular [more]

2017 May 15 1231 UTC
END OF ALL QUIET ALERT ...................... The SIDC [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]

2016 Nov 05 1349 UTC
A halo or partial-halo CME was detected with the following characteristics: [more]

Science Highlights

Apr 26, 2017: Works in progress!...

Apr 20, 2017: Impressive solar eruption

Apr 11, 2017: Airplane transits the Sun!

Apr 05, 2017: M-class flares à volonté!

Mar 29, 2017: C-class flares at last!

click here for all science highlights


Oct 26, 2016: High-speed solar wind causes major geomagnetic storm (NL-FR-EN)

May 04, 2016: Mercury Transit

Mar 23, 2016: STCE 10 years - Happy Birthday!

Click here for all the press releases

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