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.


Over the past 24 hours solar activity has been low. No significant flares
have been recorded. NOAA AR region 2681 (Catania group 55) has been most
active, producing two B-class flares. No Earth directed Coronal Mass
Ejections (CMEs) have been detected in coronograph observations. The
greater than 10MeV proton flux remained at background levels over the past
24 hours. Solar activity is expected to remain low over the next 24 hours
with a small probability of C-class flares.

The solar wind parameters remained at nominal levels over the past 24 hours
(except one short-term weak enhancement around midnight due to the
influence of a small negative polarity CH HSS). The solar wind speed is
presently about 390 km/s and still decreasing. The total magnetic field
strength has been slowly decreasing from around 10 nT to 2 nT. The Bz
component fluctuated around 0 nT and was mainly positive, ranging between
-3 and +2.5 nT (except two singular episodes of Bz = -6 and -9 nT yesterday
evening). Geomagnetic conditions ranged between Kp index 1-3 (NOAA) and
local K index 1-3 (Dourbes) over the past 24 hours. Geomagnetic conditions
are expected to be from quiet to unsettled today and tomorrow. Active
conditions till minor geomagnetic storms can be expected on September 27
due to the influence of a positive polarity CH HSS.

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

2017 Sep 22 1235 UTC
END OF ALL QUIET ALERT ...................... The SIDC [more]

2017 Sep 17 1959 UTC
A halo or partial-halo CME was detected with the following characteristics: [more]

2017 Sep 17 2248 UTC
Newly arrived coronagraph data show two halo CME observed on September [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]

Science Highlights

Sep 21, 2017: NOAA 2673's hidden secrets revealed

Sep 07, 2017: The Sun is throwing a party!

Sep 05, 2017: Weather in space is picking up

Sep 04, 2017: The ultimate eclipse maker PROBA-3

Aug 22, 2017: PROBA2 eclipse observations - first images online

click here for all science highlights


Aug 11, 2017: Eclipse fever

Jun 02, 2017: Extreme Ultraviolet Imager (EUI) ready for launch!

May 28, 2017: A coronal mass ejection as the source of a strong geomagnetic storm (NL-FR-EN)

Click here for all the press releases

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