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.


The only flare of the period was a B1.5 flare peaking at 7:37UT from a
region turning onto the disk in the East.
With no spotted regions on disk, X-ray flux is expected to remain below C
level over the next days.
SoHO/LASCO C2 images show a full halo CME from 4:36UT onwards. STEREO A
EUVI 195 clearly shows the event from around 3:15UT originating from the
backside (in relation to Earth) of the Sun. The CME will thus not influence
Another CME with limited angular width of around 100 degrees directed
towards the NorthWest was recorded slightly earlier from around 01:36UT
onwards in SoHO/LASCO C2 images. This event is also judged to have
originated from the backside of the Sun and hence will not influence
No Earth directed CMEs have been observed in coronagraph data.
Solar proton fluxes are at background values and are expected to remain

Solar wind showed the continuing influence of the coronal hole high speed
stream. Solar wind speed started and ended the reporting period around 550
km/s but reached 600 km/s during the period. Total magnetic field was
around the 5-7nT range but increased towards to over 9nT by the end of the
period. Bz was variable with peaks down to -7nT.
Over the next 2 days we should see a return to nominal Solar wind
Geomagnetic conditions were quiet to unsettled (local K Dourbes 1-3, NOAA
Kp 2-3).
Quiet to unsettled geomagnetic conditions are expected over the next days
as high speed stream effects diminish.

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

2017 Jul 23 1044 UTC
A halo or partial-halo CME was detected with the following characteristics: [more]

2017 Jul 23 1206 UTC
SoHO/LASCO C2 images show a full halo CME from 4:36UT onwards. STEREO [more]

2017 Jul 19 1216 UTC
START OF ALL QUIET ALERT ........................ The SIDC - RWC Belgium [more]

2017 Apr 03 1504 UTC
A class M5.8 solar X-ray flare occurred on 2017/04/03 with peak time 14:29UT [more]

Science Highlights

Jul 19, 2017: The Bastille Day 2017 event

Jul 10, 2017: A Sunday morning solar observing session

Jul 04, 2017: An eruptive surprize

Jun 21, 2017: A day on the Sun

Apr 26, 2017: Works in progress!...

click here for all science highlights


Jun 02, 2017: Extreme Ultraviolet Imager (EUI) ready for launch!

May 28, 2017: A coronal mass ejection as the source of a strong geomagnetic storm (NL-FR-EN)

Oct 26, 2016: High-speed solar wind causes major geomagnetic storm (NL-FR-EN)

Click here for all the press releases

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