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


Four active regions (ARs) present on the visible solar disk. No flares
above the B-class level in the past 24 hours.  Over the next 24 hours,
C-class flares can be expected, in particular from NOAA AR 2871 which has a
beta-gamma magnetic field configuration (the other 3 ARs have a beta
magnetic field configuration).

No Earth directed CMEs have been observed in coronagraph data in the last
24 hours.

The greater than 10 MeV proton flux was at background levels in the past 24
hours, and is expected to stay there in the next 24 hours. The greater than
2 MeV electron flux remained below the 1000 pfu alert threshold. Over the
next 24 hours, it is expected to remain below the threshold. The electron
fluence was at normal levels over the past 24 hours, and is expected to
remain so for the next 24 hours.

Over the past 24 hours the solar wind speed has been around 400 km/s. The
total magnetic field strength had reached 11 nT, while its Bz component
reached -6 nT. This slightly elevated magnetic field, together with low
temperature plasma, could mark the expected arrival of the ICMEs from 23
and 24 September. Due to the low speeds and mostly positive Bz, the effect
is very mild, the situation may change in the coming hours since more than
one ICME was expected.

Geomagnetic conditions were quiet to unsettled (NOAA Kp and K Dourbes 1-3)
over the past 24 hours. Active periods can be expected over the next 24

Latest SWAP image

SWAP latest image

Latest USET H-alpha image
USET latest Halpha image

Latest LYRA curve

Latest LYRA Curves

Latest Callisto Observations

Daily estimated sunspot number

Most recent alerts

2021 Sep 18 2243 UTC
A halo or partial-halo CME was detected with the following characteristics: [more]

2021 Sep 17 1129 UTC
A back-sided partial halo CME is visible in SOHO/LASCO-C2 images starting [more]

2021 Sep 07 1217 UTC
END OF ALL QUIET ALERT ...................... The SIDC [more]

2021 Jul 03 1820 UTC
A class X1.5 solar X-ray flare occurred on 2021/07/03 with peak time 14:29UT [more]