Enhancement of Lasco C1, C2, and C3 Coronagraph Images
Annual rept. 1 Feb 98-31 Jan 99
HARVARD-SMITHSONIAN CENTER FOR ASTROPHYSICS CAMBRIDGE MA
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The Large Angle Spectrometric Coronagraph LASCO on board SOHO provided unprecedented views of the solar corona since January 1996. This instrument contains three individual coronagraphs C1, C2, and C3, described in detail in Brueckner et al 1995. The C1 coronagraph acquires high resolution images 11 and higher of the lower corona from 1.1 R to 3.0 R, thereby providing a close link to the disk observations of other instruments in the SOHO complement. The C2 and C3 images have lower resolution 23 and about 2 respectively, however they provide a unique view of the extended corona up to 32 R. During the past year we carried out a study of the morphology and dynamical evolution of various structures in the solar corona as observed by LASCO and EIT. In the following, we summarize the results of this studies.