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.

FAST WARNING 'PRESTO' MESSAGE  from the SIDC (RWC-Belgium) 2014 Apr 20
14:47:53

Twelve active regions were reported by NOAA today. Three of them (NOAA ARs
2034, 2035, and 2036) have beta-gamma configuration of the photospheric
magnetic field. These three active regions and four others were responsible
for numerous C-class flares yesterday and today. None of them was
associated with an Earth-directed CME. The strongest flare of the past 24
hours was the C6.4 flare peaking at  08:13 UT today in the NOAA AR 2032 at
the west solar limb. We expect further flaring activity on the C-level,
with a good chance for an M-class event.
An interplanetary shock-like structure was detected this morning. ACE recorded jumps of solar wind speed, temperature, and the interplanetary magnetic filed (IMF) magnitude at 10:23 UT. SOHO/CELIAS detected a jump in density at 10:22 UT, but the jump in speed was detected only 20 to 30 minutes later. Therefore, this discontinuity does not seem to be a typical ICME-driven fast forward shock as ACE did not detect a jump in density at all, and jumps in density and the solar wind speed detected by SOHO/CELIAS were not simultaneous. There is, however, very little doubt that this is a start of an ICME corresponding to the halo CME observed on the Sun on April 18. During the intervals of the strongest IMF magnitude in the post-shock solar wind flow (up to 22 nT), the north-south IMF component Bz was either northward or close to zero. Unsettled geomagnetic conditions (K = 3) were reported by Dourbes and NOAA, and active conditions (K = 4) were reported by IZMIRAN. Currently the IMF magnitude is around 12 nT and the solar wind speed is around 650 km/s, so minor geomagnetic storm conditions (K = 5) are still possible.
After the arrival of the shock-like structure, the proton flux at energies above 10 MeV decreased to values below the threshold of the proton event. The proton flux, however, remains high, and in case of another solar eruption with associated SEPs, the event threshold could be easily crossed. We therefore issue a warning condition for a proton event.

Latest SWAP image
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Latest USET H-alpha image
USET latest Halpha image

Latest LYRA curve
Latest LYRA Curves

Latest Callisto Observations
Latest HUMAIN Callisto qkl

Most recent alerts

2014 Apr 20 1445 UTC
An interplanetary shock-like structure was detected this morning. ACE recorded [more]

2014 Apr 05 1842 UTC
The latest halo CME alert generated by the CACTus software package refers [more]

2013 Sep 25 1242 UTC
END OF ALL QUIET ALERT ...................... The SIDC [more]


Latest News

Apr 16, 2014: Saturday Morning Fever...

Apr 09, 2014: Small groups, big flares

Apr 02, 2014: Homologous flares

Mar 26, 2014: Waiting for the big one

Mar 20, 2014: Revolt of the filaments

click here for all the news items



Good to know

7th Solar Information Processing Workshop - Registration and abstract submission is OPEN, August 17-22, 2014

ESWW11, 17-21 November, 2014 - Abstract submission is OPEN

STCE Workshop - Long Term Solar Changes and their effect on Earth, May 19, 2014

STCE Workshop - Physical processes in solar-terrestrial plasmas, May 22 - 23, 2014

STCE Workshop - Modelling antennas & calibration of radio instruments, June 6, 2014

STCE 2014 annual meeting, June 12, 2014