Welcome to the Solar Influences Data Analysis Center (SIDC), which is the solar physics research department of the Royal Observatory of Belgium. The SIDC includes the World Data Center for the sunspot index and the ISES Regional Warning Center Brussels for space weather forecasting.


The solar activity has been quiet over the past 24 hours. The sunspot group
(NOAA 2718) remained stable and no significant flare has been recorded.
Quiet flaring conditions are expected for the next 24-hour period.

No Earth directed Coronal Mass Ejection has been observed. The solar
protons flux remained at nominal levels over the past 24 hours and is
expected to remain so.

The solar wind measurements remained enhanced due to the influence of the
solar wind associated to the Coronal Hole (which has crossed the central
meridian on August 11). The wind speed fluctuated between 450 km/s to 500
km/s; The interplanetary magnetic field strength showed a global decrease
from about 7.5 nT to below 5 nT; The Southward magnetic component
fluctuated between -6 and 5 nT. The enhanced solar wind conditions are
expected to persist for the next 24 hours and start to decline on August 18
after noon. An equatorial coronal hole of negative polarity has reached the
central meridian today around 05:00 UT, the fast solar wind speed from this
coronal hole is expected to arrive in about 3 days.

Due to the enhanced solar wind conditions, the geomagnetic conditions was
manly unsettled (K-Dourbes index was ranging between 1 and 3, and Kp index
was between 2 and 3 with a short period of 4 between 06:00 - 09:00 UT on
August 17). Unsettled conditions is expected until while the Earth remains
under the influence of the solar wind associated to the coronal hole 
(which has crossed the central meridian on August 11). The geomagnetic
conditions will then slowly begin to return to the nominal value tomorrow.

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

2018 Aug 16 1223 UTC
START OF ALL QUIET ALERT ........................ The SIDC - RWC Belgium [more]

2018 Jul 06 1102 UTC
CORRECTION - Concerning:PRESTO issued at 20:10 UT on 05-Jul-2018. Following [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]

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