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.
Jul 01, 2015: Switching to the new Sunspot Number


Solar activity has been low, NOAA ARs 2373 and 2376 have shown little
activity, producing 3 C-class flares in the past 24 hours. The largest
flares were a C1.4 class flare produced by AR 2376 peaking at 22:51 UT on
01-Jul-2015 and another C1.4 flare produced by AR 2373 peaking at 06:18 UT
on 02-Jul-2015. An eruption occurred from beyond the western limb of the
Sun at around 14:00 UT on 01-Jul-2015, the eruption produced a full halo
CME, which was detected by CACTUS at 14:36 on 01-Jul-2015 with a velocity
of 346 km / s. The CME exhibited no on-disk signatures and is believed to
be back-sided, occurring close to the west limb. There was a small increase
in protons related to the event, but this did not exceed 5 pfu at the

The solar wind speed has been steadily decreasing over the past 24 hours,
from 450 to 400 km / s. The total magnetic field has been relatively stable
around 5 - 6 nT, and the Bz component has fluctuated from positive to
negative, between +6 and -5 nT over the past 24 hours. Geomagnetic
conditions ranged between Kp index 1-2 (NOAA) and local K index 0-3 over
the past 24 hours, similar conditions are expected to persist. There was
one CME in the past 24 hours (see details above), which emerged from beyond
the West limb, it is not expected to produce any significant activity at
the Earth. There is one transient coronal hole currently located in the
South, which may enhance solar wind speeds at the Earth in a few days.

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 Jul 02 0149 UTC
A halo or partial-halo CME was detected with the following characteristics: [more]

2015 Jul 02 1027 UTC
A halo CME was detected by CACTUS at 14:36 on 01-Jul-2015 with a velocity [more]

2015 Jun 25 0906 UTC
A class M7.9 solar X-ray flare occurred on 2015/06/25 with peak time 08:16UT [more]

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

Science Highlights

Jun 24, 2015: First proton event of 2015

Jun 09, 2015: Filament eruption

May 27, 2015: Layer upon layer

May 20, 2015: Twisting beauties

May 06, 2015: A stethoscope for the Sun

click here for all science highlights


Jul 01, 2015: Switching to the new Sunspot Number

May 06, 2015: Extreme Space Weather: flares (NL-FR-EN)

Mar 20, 2015: Solar Eclipse

Click here for all the press releases

Good to know

Space Weather for Engineers - registration is open

Natural Hazards for Aviation Workshop - June 2 2015

ESWW12 - Abstract submission!

STCE annual meeting - 11 June 2015