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


The solar activity was at very low levels with no significant solar flares
observed. Catania sunspot group 28 (NOAA Active Region 2757, N04W33)
remained inactive and has decayed to Hale class alpha in the past 24 hours.
The solar activity is expected to remain at very low levels in the next 24
hours. Quiet flaring conditions are expected for the next 24-hour period
with no significant flares expected from the decaying sunspot region NOAA
2757 in the north-western quadrant, nor from the plague region in the
eastern hemisphere.

No Earth-directed coronal mass ejections (CMEs) were observed in the
available coronagraph imagery.
The greater than 10 MeV solar proton flux was at nominal levels and is
expected to remain so.

The solar wind speed over the past 24 hours has increased from 300 to
around 500 km/s (ACE) probably due to the influence of the patchy negative
polarity coronal hole observed on Jan 25. The total interplanetary magnetic
field reached values of 8 nT. The Bz component reached a minimum of -8 nT
between 21 UTC on Jan 28th and 02 UTC on Jan 29th. The polarity of the
interplanetary magnetic field was predominantly in the negative sector with
short positive intervals.

The geomagnetic activity over the past 24 hours has been quiet until 21 UTC
when several unsettled periods occurred, due to the arrival of the high
speed stream from the negative polarity coronal hole, when both local K
(Dourbes) and NOAA Kp indexes reached a value of 3. Throughout the next 24
hours the geomagnetic conditions are expected to remain predominantly quiet
with isolated unsettled periods due to the remaining influence of the
observed high speed stream. The CME observed by STEREO-A on Jan 25th with
estimated arrival on Jan 30th might contribute to the periods with
unsettled geomagnetic conditions predicted for that day.

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 Jan 27 1241 UTC
START OF ALL QUIET ALERT ........................ The SIDC - RWC Belgium [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]