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 sunspot group which appeared from the behind of the East solar limb
yesterday got numbered as Catania sunspot group 78 (NOAA AR 2706). This
sunspot group was source of the all (low B-class), flaring activity during
last 24 hours. We expect that Catania sunspot group 78 might be the source
of the B-class flares and possibly also isolated C-class flare in the
following 24 hours.
There were no Earth directed CMEs observed since the last report and the
solar protons remain at the background level.

The in situ observations showed sudden increase of the interplanetary
magnetic field magnitude (IMF), solar wind speed, density and temperature
at about 23:19 UT yesterday evening. All this indicates arrival of the
shock wave, however presently it is still unclear if the shock wave will be
followed by the ICME or this is a shock in the solar wind related with the
expected arrival of the fast flow. 
The shock wave was followed by gradual increase of the solar wind speed and
IMF. The fast solar wind (up to 515 km/s) and longer intervals of negative
values of the Bz component of the IMF (down to -19 nT), resulted in the
active to storm geomagnetic conditions reported this morning (local station
at Dourbes reported K=5 and NOAA reported Kp=6).
The solar wind speed is presently about 480 km/s and the IMF is about 14
nT. If the solar wind speed will continue to increase and the Bz component
will show longer intervals with negative values we can expect continuation
of the disturbed geomagnetic conditions in the coming hours.

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

2018 Apr 20 1041 UTC
Long intervals of negative values of Bz component of the interplanetary [more]

2018 Apr 17 1201 UTC
END OF ALL QUIET ALERT ...................... The SIDC [more]

2017 Sep 17 1959 UTC
A halo or partial-halo CME was detected with the following characteristics: [more]

2017 Sep 10 1650 UTC
A class X8.9 solar X-ray flare occurred on 2017/09/10 with peak time 16:06UT [more]

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