The SIDC is part of the Royal Observatory of Belgium and a partner in the Solar Terrestrial Center of Excellence (STCE).


The not-numbered active region which was the source of 12 B-class, 2
C-class flares and 1 M-class flare, during last 36 hours seems to decrease
its flaring activity. This active region just rotated to the visible side
of the Sun, and it is presently situated close to the North-East solar
limb. We can still expect some B-class, C-class and possibly also isolated
M-class flares in the coming hours.
During last 24 hours there were no Earth directed CMEs and the solar
protons remained at the background level.

At about 19:20 UT on May 29, the interplanetary magnetic field magnitude
started to slowly increase simultaneously with the solar wind speed,
temperature and density. The interplanetary magnetic field magnitude
reached maximum value of about 14 nT (at about 05:15 UT this morning), and
its Bz component had simultaneously the minimum value of -12 nT.
It is presently not completely clear if this is arrival of the faint CME or
the corotating interaction region. However the sudden change of the phi
angle (sector boundary) to negative value indicates that observed structure
is the compression region in front of the fast solar wind originating from
the negative polarity coronal hole.
The arrival of this structure induced the unsettled geomagnetic conditions
(Dourbes reported longer interval of K=3 and NOAA reported Kp=3). We expect
unsettled to possibly active 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

2020 May 29 1219 UTC
END OF ALL QUIET ALERT ...................... The SIDC [more]

2019 Oct 25 0924 UTC
Geomagnetic conditions have reached moderate storm levels (NOAA Kp=6 for [more]

2018 May 04 1644 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]