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 did not produce any flares in the past 24 hours. The chance for a C
flare in the next 24 hours is estimated at 5%. No Earth-directed Coronal
Mass Ejections (CMEs) were observed in available coronagraphic imagery. The
greater than 10 MeV proton flux was at nominal levels.

In the past 24 hours, solar wind speed measured by DSCOVR varied between
about 440 and 540 km/s, with current values around 475 km/s. The magnitude
of the Interplanetary Magnetic Field (IMF) varied between 1 and 9 nT. Bz
was around -5 nT between 15:45 and 17:15 UT on December 12. A high speed
stream from a recurrent positive equatorial coronal hole is expected to
arrive in the second half of December 15 or early on December 16. Quiet to
active geomagnetic conditions (K Dourbes between 1 and 4; NOAA Kp between 1
and 4) were registered in the past 24 hours. The active interval (K Dourbes
= 4) between 18h and 21h UT on December 12 was related to Bz values around
-5 nT. Quiet to active geomagnetic levels (K Dourbes < 5) are possible on
December 13 and 14 and the first half of December 15, with a chance for
minor storm conditions (K Dourbes = 5). Quiet to minor storm conditions (K
Dourbes < 6) are expected in the second half of December 15, with a chance
for moderate geomagnetic storm intervals (K Dourbes = 6), due to the
expected arrival of a high speed stream from a recurrent positive
equatorial coronal hole.

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 Dec 10 1925 UTC
END OF ALL QUIET ALERT ...................... The SIDC [more]

2017 Nov 14 0946 UTC
The in situ observations (from DSCOVR satellite), show sudden increase [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

Dec 06, 2017: Reappearance

Nov 17, 2017: A New STAFF

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

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

Oct 11, 2017: The Sun is spotless again!

click here for all science highlights


Nov 24, 2017: Fourteenth European Space Weather Week

Sep 28, 2017: Recurrent Coronal Hole

Aug 11, 2017: Eclipse fever

Click here for all the press releases

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