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 with the X-ray flux mostly below C-class
flare over the last 24 hours. Catania Sunspot 74 (NOAA Active Region 2898)
has now fully turned over the west limb, nevertheless, a C1.6-class flare
and several coronal mass ejections was observed from Earth prospective.
Catania Sunspot 80 (NOAA Active Region 2902) and NOAA Active Region 2904
produced small C1.3-class flares. Solar activity is expected to be at low
levels, with a slight chance for a C-class flare.

Multiple backside Coronal Mass Ejections (CMEs) with a relatively low speed
(less than 600 km/s) were observed, and were associated with the activity
beyond the west limb in Catania Sunspot 74 (NOAA Active Region 2898). A
very faint CME was observed on December 5 around 14:00 UTC near the
south-east limb. This CME is associated with the filament that was
stretching across the central meridian in the southern hemisphere.
Currently no strong Earth directed component of the CME is identified,
however further analysis of the CME is currently in progress.

The greater than 10 MeV proton flux was at nominal levels in the past 24
hours and is expected to remain at nominal levels in the next 24 hours. The
greater than 2 MeV electron flux exceeded the 1000 pfu alert threshold in
the past 24 hours but is expected to remain just below or at this threshold
in the next 24 hours. The greater than 2 MeV electron fluence was moderate
levels in the past 24 hours and is expected to be at between nominal and
moderate levels in the next 24 hours.

The solar wind speed (ACE+DSCOVR) remained elevated with values ranging
between 430 km/s and 550 km/s. The total magnetic field was below 7 nT, and
its southward component, Bz, fluctuated between -6 nT and +5.5 nT. The
interplanetary magnetic field phi angle was predominantly in the positive
sector (directed away from the Sun). The solar wind speed is expected to
remain elevated with possible further enhancements due to the influence of
the high-speed streams from the positive polarity Coronal Hole (CH) that
began to traverse the central meridian on Dec 02. The solar wind is then
expected to gradually return to a slow solar wind regime from Dec 07. A
small equatorial CH (negative polarity) has crossed over the central
meridian, the high-speed streams from this CH may enhance the solar wind
parameters near Earth around December 10-11.

Geomagnetic conditions were quiet to unsettle over the past 24 hours (NOAA
Kp and K-BEL recorded values of 1-3 and 1-2, respectively). Geomagnetic
conditions are expected to be mostly quiet with isolated unsettled periods

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 Nov 27 2244 UTC
A shock was observed in DSCOVR data at 21:55 UT. The magnetic field jumped [more]

2021 Nov 27 1232 UTC
END OF ALL QUIET ALERT ...................... The SIDC [more]

2021 Nov 02 1041 UTC
A halo or partial-halo CME was detected with the following characteristics: [more]

2021 Oct 28 1604 UTC
A class X1.0 solar X-ray flare occurred on 2021/10/28 with peak time 15:34UT [more]