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


Solar activity remained at very low levels over the last 24 hours. Sunspot
group Catania 86 (NOAA 2814) further increased its number of sun spots,
remaining magnetic type Beta. Two other unnumbered sunspot groups are
visible on the solar disc. One of them was reported to emerged on April
15th close to the centre and visible this morning around S22W15, while the
one rotated from the east limb, being close to S22E70. All three active
regions currently show low levels of activity. The flaring activity within
the next 24 hours is expected to remain low with some chance for C-class

No Earth-directed coronal mass ejections (CMEs) were detected in the
available coronagraph imagery. 

The greater than 10 MeV proton flux was at nominal levels in the past 24
hours and is expected to remain so in the next 24 hours. The greater than
2MeV electron flux remained under the 1000 pfu threshold and is expected to
remain so. The 24h electron fluence was at nominal levels and is expected
to be predominantly at nominal in the next 24 hours.

Over the past 24 hours the solar wind parameters (ACE and DSCOVR)
registered slight enhancements due to the expected arrival of a high speed
stream (HSS) from a negative polarity coronal hole (CH). The total magnetic
field reached a magnitude of 10.5 nT with a minimum Bz of -7.4 nT. The
solar wind speed is gradually increasing, peaking at 488 km/s, and is
expected to increase further.

The geomagnetic conditions over the past 24 hours were quiet to unsettled.
Quiet to active geomagnetic conditions are expected in the next 24 hours
with a possibility for a minor geomagnetic storm.

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 Apr 15 0946 UTC
END OF ALL QUIET ALERT ...................... The SIDC [more]

2021 Apr 14 0853 UTC
A faint and slow partial halo CME is observed by LASCO C2 and C3 coronagraphs [more]

2021 Mar 18 0131 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]