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 at low levels with region 2403 producing the
only noteworthy flare of the period, a C2.2 flare peaking at 5:22UT from at
the West limb. New flux emergence was noted near N15W48 as well as near
S15E70 which were numbered NOAA active regions 2407 and 2408 repectively.
Some more flux emergence appears to be visible near N15W10.
The regions currently on disk are not very complicated or active, but
together with also the new emerging regions developing we judge that there
do remains a fair chance for C flaring in the next 24 hours.
The warning condition for a proton event is lifted with the departure of
active region 2403 behind the West limb.
No Earth directed CME's were recorded.
Solar wind showed the decay of the influence of the negative polarity
equatorial coronal hole high speed stream. Speeds dropped to around 390
km/s. Total magnetic field was around 5 nT with Bz variable.
Geomagnetic conditions were quiet at planetary level (NOAA Kp 1-2) with
some unsettled periods locally (local K Dourbes 0-3).
A further decay to nominal solar wind conditions and associated quiet
geomagnetic conditions is expected in the first 24 hour. Afterwards, a
sector boundary crossing followed by the influence of the positive polarity
equatorial coronal hole high speed stream is expected to elevate solar wind
conditions with active to minor geomagnetic storms possible. 

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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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