Physics
Scientific paper
Sep 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003esasp.535..435c&link_type=abstract
In: Solar variability as an input to the Earth's environment. International Solar Cycle Studies (ISCS) Symposium, 23 - 28 June 2
Physics
4
Solar Corona, Coronal Mass Ejections (Cmes), Dimming
Scientific paper
We describe two halo coronal mass ejection (CME) events as examples of our analysis of dimmings simultaneously in three coronal and one transition region lines by forming of rerotated SOHO/EIT difference images with 6- or 12-hour intervals. It is shown that usually the dimmings are most pronounced and have similar large-scale structures in the moderate-temperature coronal lines 171 and 195 Å. In the high-temperature line 284 Å, analogous dimmings are visible not always, and sometimes the deepest dimming fragments are visible only. On-disk CME events display also clear, but relatively small-area dimmings in the transition region line 304 Å particularly in regions joining to a main eruption source, although sometimes remote dimming patches are present as well. These results suggest that not only opening of magnetic field lines, resulting in density and emission depletion, but also temperature variations may be responsible for observed dimmings, and that these effects may also extend into cooler plasma of the transition region.
Chertok I. M.
Grechnev Victor V.
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