news
Submitted on 2005-03-04
A halo coronal mass ejection (CME) was detected by the CACTus-software. The halo CME was part of a whole series of ejections fired of from late February 28 up till March 2. Contrary, EIT195 shows a quiet Sun.
On March 1, 2005 a halo CME-alert was sent by CACTus, a software that detects automatically CMEs from LASCO pictures. The CME left the occulting disk of LASCO/C2 at 04:54UT and had a angular width of 196 degrees. The cloud was ejected mainly to the north.
Submitted on 2005-02-22
An extremely large filament is visible on the solar disk. The length of the filament is even more then 60 times the diameter of Earth! At the moment, the plasma structure is quiet and not 'wobbling'.
A filament is a cloud of plasma suspended above the solar surface. Magnetic arcades act as a hammock in which the plasma rests. The filament appears as a dark ribbon in pictures like H-alpha (visible light) since it absorbs radiation from the solar surface below it and redistributes it in all directions so that the net radiation coming towards us, is less.
Submitted on 2005-01-26
The sunspot group with Catania number 05 (NOAA 0720) rotated over the west limb on January 22. While it was visible on the solar disk, it dominated space weather and was responsible for a few days of severe geomagnetic disturbances.
Submitted on 2005-01-14
We are still in the declining phase of the solar cycle as can be seen in different physical quantities, like the 10cm flux. However, a really big sunspot group is pushing up the present 10cm flux-curve.
Submitted on 2004-12-23
In Dinant, one could see for many years a telescope in one of the backyards, pointing at the Sun. This observation station was run by the oldest SIDC observer.
Submitted on 2004-12-07
From November 29 to December 3, 2004, the first European Space Weather Week was held in ESTEC, the technical office of the European Space Agency (ESA) in the Netherlands.
Submitted on 2004-11-16
After the turbulent period beginning of November 2004, the solar activity cooled down considerably. No flares reaching the M/X level or halo coronal mass ejections (CMEs) were reported in recent days.
Submitted on 2004-11-09
Sunspot group 61 (NOAA 0696) fired a series of halo coronal mass ejections (CMEs). The geomagnetic field was seriously messed up when they arrived at Earth. On November 7, the group produced a X2.0 flare accompanied with another CME. The shock arrived at this very moment (November 9, 09:45UT)! A severe geomagnetic storm is expected.
Submitted on 2004-10-29
From October 10, up to October 16, the Sun was veiled in silence and produced hardly any flare. On October 17, the Sun changed track and gave birth to several sunspot groups during the next days.
Submitted on 2004-10-19
It is with great sadness that we inform you of the sudden death of Pierre Cugnon on October 18, due to complications following heart surgery.
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