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.


NOAA 2603 produced the strongest event of the period, a B1.9 peaking at
20:42UT. This region has now a mature but small trailing spot, and seems to
have simplified magnetically. A strong coronal mass ejection (CME) over the
northeast solar limb was observed in LASCO/C2 starting 25 October around
19:00UT. Its source was located on the farside of the Sun (old active
region NOAA 2599). No earth-directed CMEs were observed. 

Quiet flaring conditions are expected to continue, with a small chance on
an isolated C-class flare.

Earth was under the influence of the high speed stream (HSS) from the huge
coronal hole (CH). Maximum solar wind speeds near 830 km/s were recorded
around 23UT on 25 October (DSCOVR), its current values now fluctuating
between 670 and 750 km/s. Bz varied between -15 and +9 nT during the first
half of the period, but is currently fluctuating between -6 and +6 nT. The
interplanetary magnetic field (IMF) was directed away from the Sun
(positive). Kp ranged from active to major geomagnetic storming, while K
Dourbes ranged from quiet conditions to moderate storming.    
Wind speeds are expected to remain above 500 km/s for the next two days,
with periods of sustained negative Bz possible. Hence, mostly unsettled to
moderate storm conditions are expected, with a small chance on another
major storming interval (K-index = 7).

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 Oct 25 1650 UTC
As expected, the arrival of the co-rotating interaction region (CIR) and [more]

2016 Sep 06 1458 UTC
The Halo CME alert issued by CACTus on 2016 Sep 06 1344 UTC was false. [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

Oct 19, 2016: Sunspot gets a facelift

Oct 03, 2016: So long, filament!

Sep 28, 2016: Return of the Behemoth

Sep 20, 2016: Farside eruption

Sep 12, 2016: Collateral damage

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

Good to know

ASGARD: balloons for science

Medals in Space Weather

Another Eclipse seen by PROBA2