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.
Aug 18, 2015 DB: The Sunspot Number, the "longest ongoing scientific experiment" revisited


During the past period, there were only three active regions on the solar
disk. Four lower C-class flares and one M1.0 (peaking at 2:41 UT on October
4) flare were observed. The M1 flare originated from NOAA 2422, though
being almost completely behind the West limb. NOAA 2427 now is a beta-gamma
region, though it did not produce any significant flares the past 24 hours.
Flaring activity at the C-level is expected.  An extended equatorial
positive polarity coronal hole has reached the central meridian and will be
geo-effective within about 3 days.

Solar wind observations show a slight increase in speed (up to 500 km/s)
and temperature from 15 UT October 4 on. The interplanetary magnetic field
magnitude was maximally around 10 nT, with a mainly negative Bz component.
Solar wind is expected to remain slightly disturbed and possibly indicate
the arrival of a glancing blow related to the September 30 CME 
later today. Geomagnetic conditions were unsettled at the local level
(Dourbes K=3) and active (NOAA Kp=4 at 3-6 UT) to even minor storm (NOAA
Kp=5 at 9 UT) levels at the planetary level. Geomagnetic activity could be
at to active or minor storm conditions during the next 24 hours.  

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

2015 Oct 02 0048 UTC
A class M5.5 solar X-ray flare occurred on 2015/10/02 with peak time 00:13UT [more]

2015 Oct 01 0149 UTC
A halo or partial-halo CME was detected with the following characteristics: [more]

2015 Oct 01 0655 UTC
A series of CMEs were launched of which at least two were related to a [more]

2015 Jun 02 0746 UTC
END OF ALL QUIET ALERT ...................... The SIDC [more]

Science Highlights

Sep 30, 2015: Rise and Shine!...

Sep 23, 2015: Another head-to-tail collision

Sep 16, 2015: PROBA2 observes an annular solar eclipse

Sep 09, 2015: Polar faculae near the Sun's south pole

Sep 02, 2015: Showtime!

click here for all science highlights


Aug 18, 2015 DB: The Sunspot Number, the "longest ongoing scientific experiment" revisited

Aug 11, 2015 PV: The Perseids - don't miss it

Jul 01, 2015 FC : Switching to the new Sunspot Number

Click here for all the press releases

Good to know

ASGARD - Balloons for science : Project call

ESWW12 - Early bird registration until October 1