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.

Solar Eclipse, March 20, 2015


Despite the many regions on disc solar flaring activity was low with only a
single C1.0 flare peaking at 00:52UT at the North-East limb. 
NOAA region 2321 showed some further field diffusion. Some flux emergence
was observed in the trailing end of NOAA region 2322. Region 2325 has grown
slightly. Region 2329 showed separation of the magnetic footpoints. A new
region emerged near N15E38.
Other regions were stable or in decay.
Flaring at C level is likely over the next days.
A (combined) partial halo CME was visible at the West limb of the Sun with
an angular width of over 200 degrees and projected speeds as determined by
cactus of close to 500 km/s. It concerned a combination of two CME's. The
first one is first visible in SoHO/LASCO C2 at 21:12 UT, is directed to the
South-West, and is associated with a filament eruption visible in SDO/AIA
304 of the South-West solar limb.
The next CME is visible from 21:48 UT onwards slightly more northward on
the South-West solar limb. No on-disc signatures could be associated to
that event and the second event is therefore likely to be backsided. Based
on the location of their origin neither of those CME's is expected to have
influence on Earth.
Proton levels were at background values.
Solar wind speed more or less stabilised around the 400 km/s level. Total
magnetic field increased from around 4.5 nT to 7nT before dropping to 4.5
nT again around 9:00 UT. Bz was variable in the +-5nT range. The magnetic
field phi angle was stable in the toward sector.
Magnetic conditions have been quiet to unsettled (NOAA Kp 1-3 and local K
Dourbes 2-3).
Nominal solar wind conditions and associated quiet to unsettled geomagnetic
conditions are expected in the first 24 although possibly a positive
coronal hole high speed stream may increase solar wind conditions later in
the day. Afterwards on 22/23 April the arrival of the April 18 CME can be
expected leading to active to minor geomagnetic storm conditions.

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Latest USET H-alpha image
USET latest Halpha image

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Latest Callisto Observations

Latest HUMAIN Callisto qkl

Daily estimated sunspot number

Most recent alerts

2015 Apr 20 0449 UTC
A halo or partial-halo CME was detected with the following characteristics: [more]

2015 Apr 20 1109 UTC
The latest Cactus partial-halo CME alert concerned the combination of two [more]

2014 Aug 08 1211 UTC
END OF ALL QUIET ALERT ...................... The SIDC [more]

Science Highlights

Apr 15, 2015: NOAA 2321: one, two or three groups?

Apr 09, 2015: Impressive filament eruption

Apr 02, 2015: Divergent

Mar 26, 2015: NOAA 2297 targets Earth

Mar 12, 2015: Marvellous M-flares

click here for all the news items

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