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.


Over the past 24 hours solar activity has been low. The largest flare was a
C2.2 class flare. Active Region (AR) 2583 (Macintosh class:Dao; Mag.
type:Beta) has been most active, producing several C class flares,
including the C2.2 class flare, which peaked at 03:34 UT. All other ARs
have shown low levels of activity. AR 2583 and 2580 (Hrx; Alpha) have shown
evidence of flux emergence, separation and cancellation in HMI magnetogram
observations, this may increase flaring activity. However, the region is
approaching the West solar limb. A filament channel is currently located
near disk center, but appears stable. Solar protons have remained at
background levels over the past 24 hours. Solar activity is expected to
remain low over the next 24 hours with a high probability of C-class flares
and a low probability of M-class flares.
The solar wind speed has fluctuated between 380 and 320 km/s over the past
24 hours. The total magnetic field strength has remained around 4 nT
throughout yesterday and this morning, however it jumped toward 10 nT in
the last hour. The Bz component was largely positive, fluctuating between
-5 and +10 nT. Geomagnetic conditions ranged between Kp index 0-2 (NOAA)
and local K index 0-3 (Dourbes) over the past 24 hours. A small
trans-equatorial coronal hole located at central latitudes, N01W50, is
expected to enhance solar wind speeds at Earth due to its associated
high-speed stream (HSS). This may enhance geomagnetic activity. A large
positive polarity Northern polar coronal hole located near central
longitudes extending toward low latitudes is expected to enhance solar wind
speeds in coming days. Geomagnetic activity is expected to be slightly
enhanced later today and again later in the week.

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 Jul 25 0625 UTC
A shock-like feature was observed in the solar wind parameters on 23 July [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]

2016 May 16 0149 UTC
A halo or partial-halo CME was detected with the following characteristics: [more]

Science Highlights

Aug 11, 2016: Sun-grazing comet mystery

Jul 26, 2016: A spectacular flare

Jul 19, 2016: Sunspot neighbours

Jul 12, 2016: SC24 highlights page

Jul 06, 2016: Backside eruptions

click here for all science highlights

Comet tail seen by LASCO/C2

May 04, 2016: Mercury Transit (NL-FR-EN)

Mar 23, 2016: STCE 10 years - Happy Birthday (NL-FR-EN)

Jan 15, 2016: Space Technology & Calibration Laboratories

Click here for all the press releases

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