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 the solar activity was very low. Only small B-class
flares and one non-Earth directed slow-speed CME were recorded. Catania
sunspot groups 56 (NOAA active regions 2681) has increased its magnetic
complexity (from Alpha to Beta class), but has not shown any flaring
activity. The returning region NOAA active region 2682 (previously, Catania
sunspot group 46, NOAA active region 2673) is now on the visible disc and
is the source of the slow-speed CME and B-class flaring activity. Its
magnetic complexity is difficult to estimate due to the projection effect,
however, it seems to have drastically decay from the previous solar
rotation. We expect the solar activity to increase due to the return of
this region with C-class flares. 

No Earth directed CMEs have been observed and the solar protons remained at
background level over the past 24 hours.
The Earth remained inside a slow solar wind flow. The speed has further
decreased from about 400 to 330 Km/s. The interplanetary magnetic field
magnitude remained below 6 nT and the Bz component fluctuated between -5
and 5 nT. The associated fast solar wind to the small equatorial coronal
hole that has crossed the central meridian on Sept 20 has not arrived yet
and is expected to arrive at Earth today. A new larger coronal hole with
positive polarity is currently facing Earth. This coronal hole is elongated
from the north solar pole to the solar Equator and its high speed stream is
expected to arrive at Earth in about 3 days from now (on Sept 27).

Geomagnetic conditions were quiet with Kp (NOAA) and local K (Dourbes)
indexes ranging between 1-2. The geomagnetic conditions are expected to
become more active with the arrival of the high speed stream from the
coronal hole that has crossed the central meridian on Sept 20. As this
coronal hole was relatively small, no strong or sever magnetic storm is

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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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