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


Solar activity was at low levels over the past 24 hours. There is one
numbered Active Region (AR) on the solar disk, NOAA AR 2797 (alpha), which
remained stable. NOAA AR 2799 (alpha) has now rotated over the west solar
limb. Solar activity is expected to remain at low levels, with a low
probability of a C-class flare.

No Earth directed Coronal Mass Ejections (CMEs) have been detected in the
available coronagraphic imagery. 

The greater than 10 MeV proton flux was at nominal levels over the past 24
hours and is expected to remain so for the next 24 hours. The greater than
2 MeV electron flux was enhanced but remained mostly just below the 1000
pfu threshold during past 24 hours, until 11:40 UT when it briefly crossed
the threshold. The electron flux is expected to remain enhanced and is
likely to cross this alert threshold again during the next 24 hours. The
24h electron fluence was at nominal levels and is expected to be at nominal
to moderate levels over the next 24 hours.

Over the past 24 hours, the solar wind speed remained elevated with values
ranging between 480 and 580 km/s (DSCOVR). The total magnetic field
strength fluctuated around 5 nT. Bz had a minimum value of -5 nT. The
interplanetary magnetic field was predominantly directed towards the Sun
(phi angle in the negative sector). Over the next 24 hours, the solar wind
speed is expected to gradually decrease as the influence from the
high-speed stream that is currently influencing the Earth continues to

Geomagnetic conditions were at quiet to unsettled levels (NOAA Kp and local
k Dourbes recorded values between 2-3 and 1-3, respectively.)  Geomagnetic
conditions are expected to be at quiet to unsettled levels for 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

Latest HUMAIN Callisto qkl

Daily estimated sunspot number

Most recent alerts

2021 Jan 18 1227 UTC
END OF ALL QUIET ALERT ...................... The SIDC [more]

2021 Jan 11 1035 UTC
The in situ observations show the arrival of a slow shock wave registered [more]

2020 Dec 09 1019 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]