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) showed a decay 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 under the influence of the solar wind
associated to the Coronal Hole (which has crossed the central meridian on
August 11). The wind speed reached 575 km/s; The interplanetary magnetic
field strength remained below 5 nT; The Southward magnetic component
fluctuated between -5 and 5 nT. The solar wind speed is now expected to
slowly decrease today and tomorrow. The solar wind will then be re-enhanced
due to arrival of the fast wind associated with the equatorial coronal hole
that has reached the central meridian on August 17.

Due to the enhanced solar wind conditions, the geomagnetic conditions were
mainly unsettled (with a short period of 4 around 00:00 UT on August 17
recorded by K-index (Dourbes), and around 12:00 UT on August 18 recorded by
Kp-index (NOAA)). Unsettled conditions are expected until while the Earth
remains under the influence of the solar wind associated to the coronal
hole. The geomagnetic conditions will slowly begin to return to the nominal
value today and 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 18 1222 UTC
END OF ALL QUIET ALERT ...................... The SIDC [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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