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


The Sun has been quiet over the past 24 hours, NOAA Active Region (AR) 2376
produced the only C-class flare, peaking at 22:11 UT on 2015-Jul-30. We
expect flaring activity on the C-level from ARs 2373 and 2376, with an
M-class flare being unlikely. Proton levels are still declining and are now
below 1 pfu. Other recurrent active regions are rotating into view now and
may increase solar activity in the coming days.
The Earth is currently in a slow solar wind flow with the speed around 400
km / s, but will be moving into a fast solar wind stream over the coming
days which should enhance the speed. The total magnetic field has been
around 5 nT with small fluctuations, and the Bz component has fluctuated
from positive to negative, between +5 and -5 nT over the past 24 hours.
Geomagnetic conditions ranged between Kp index 1-3 (NOAA) and local K index
1-3 over the past 24 hours, similar conditions are expected to persist.
There were no significant CMEs over the past 24 hours. There is one
transient coronal hole currently located in the South East, which may
enhance solar wind speeds in a few days.

From July 1st, 2015 onwards, the Sunspot Number archive has been replaced
by a new re-calibrated series. The processing of the sunspot numbers has
been adapted, which leads to a change in the scale of the Estimated ISN
numbers reported below. For more details, please visit the SILSO Web pages:

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 Jun 27 0738 UTC
The CME from June 25 arrived at 02:20 UT, with speeds reaching 900 km/s [more]

2015 Jun 25 1654 UTC
A halo or partial-halo CME was detected with the following characteristics: [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