Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999esasp.446..275d&link_type=abstract
8th SOHO Workshop: Plasma Dynamics and Diagnostics in the Solar Transition Region and Corona. Proceedings of the Conference hel
Astronomy and Astrophysics
Astrophysics
2
Scientific paper
The Extreme ultra-violet Imaging Telescope provide observations of the whole solar disc in the chromospheric He II line at 304 A and in the low coronal Fe XII line at 195 A. In the chromospheric line, the ejections of the prominences are well observed. In the coronal line, propagations of cavities above the limb or of dimmings of the solar surface are observed. We compared the events seen in He II and in Fe XII to the coronal mass ejections observed with the Large Angle and Spectrometric Coronagraph C2 in white light emitted in a region and at a time which can be related to the underling events. We found that the He II events are very difficult to compare to the CMEs. They evolve on only two image in average. So we can suspect that we miss the most chromospheric event using a 17 minutes cadence between two images. In Fe XII, the cavities and dimmings are related in the most of the cases to CMEs. They are emitted above active regions or prominences. Active regions produced faster (300 km/s) CMEs than prominences did (100 km/s).
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