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.


Solar activity is low, without C-class flares reported during last 24
hours. No significant changes of solar activity are foreseen in the coming
hours. The isolated C-class flares are possible but not very probable. No
Earth directed CMEs were observed in the last 24 hours.

The Earth is presently inside the slow solar wind with the speed of about
320 km/s. The interplanetary magnetic field magnitude is about 4nT, and the
Bz component of the interplanetary magnetic field is fluctuating with
values down to -4 nT. The increase of the solar wind speed is possible in
the coming hours, due to the late arrival of the fast flow associated with
the low latitude extension of the northern polar coronal hole which reached
central meridian in the morning of January 12.
The equatorial coronal hole with the elongated extension towards the south
has crossed central meridian this morning. The associated fast solar wind
might arrive at the Earth late on January 18 or in the morning of January
19. The geomagnetic conditions are presently quiet and we expect them to
stay so in the coming hours.

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

2016 Dec 31 1224 UTC
From 9h UT on December 31 onwards, solar wind speed gradually increased [more]

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

2016 Jul 24 0516 UTC
A class M5.5 solar X-ray flare occurred on 2016/07/23 with peak time 05:31UT [more]

2016 Jul 05 2210 UTC
END OF ALL QUIET ALERT ...................... The SIDC [more]

Science Highlights

Jan 16, 2017: RoboSWOP in a space game EUFHORIA looking for sunspot treasures

Jan 05, 2017: Spotless Days page

Dec 22, 2016: The first sunspot of cycle 25 is seen!

Dec 05, 2016: PROBA2's 45 X-class flares

Nov 29, 2016: First radio burst for ARCAS

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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