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.
Aug 18, 2015: The Sunspot Number, the "longest ongoing scientific experiment" revisited


Solar flaring activity was moderate with two M flares from region 2403 in
adiition to several C flares from that region. An M2.2 flare peaked at
13:16UT and another M2.1 flare peaked at 19:03UT.
Flaring at M level remains likely from this region with a possibility for
an X flare.
There remains also an associated risk for a proton event.
Solar flaring activity will afterwards decrease as the region is about to
round the West limb two days from now.
No significant Earth directed CME's were recorded.
Solar wind conditions indicated the arrival of the expected high speed
stream influence. Solar wind speed increased from about 340 km/s at the
start of the period to within the 420-480 km/s range. Total magnetic field
first increased up to a peak of 17nT while a pronounced negative Bz
persisted, before around 18:00UT a steady decrease towards presently 7-8nT
set in along with a more variable Bz and a temperature increase.
Quiet to moderate geomagnetic storm conditions were recorded. Local K
Dourbes attained at most active levels (K=4 in the first halve of the
period) while the planetary NOAA Kp reached 6 also in the first halve of
the period.
Solar wind speed is expected to first remain elevated before starting a
decline towards nominal values while also the decrease in total magnetic
field is expected to continue. Quiet to unsettled geomagnetic conditions
are thus expected with a possibility for episodes of active conditions. 

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 Aug 27 0934 UTC
While solar wind speeds are at or around background levels (360-390 km/s), [more]

2015 Aug 24 0806 UTC
A class M5.6 solar X-ray flare occurred on 2015/08/24 with peak time 07:33UT [more]

2015 Aug 13 1049 UTC
A halo or partial-halo CME was detected with the following characteristics: [more]

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

Science Highlights

Aug 05, 2015: Holy loopiness!

Jul 29, 2015: STEREO-A's reawakening

Jul 23, 2015: A complex filament eruption

Jul 16, 2015: Coincidence

Jul 08, 2015: The solar cycle's new clothes

click here for all science highlights


Aug 18, 2015: The Sunspot Number, the "longest ongoing scientific experiment" revisited

Aug 11, 2015: The Perseids - don't miss it

Jul 01, 2015: Switching to the new Sunspot Number

Click here for all the press releases

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