White-Light and Infrared Coronal Observations During the 11 July 1991 Total SolarEclipse

摘要

Observational evidence for unbiquitous fine-scale structures the solar corona,which can evolve rapidly, are discussed. The Canada-France-Hawaii Telescope (CHFT) was used during the 11 July, 1991 total solar eclipse to obtain high-angular-resolution images of the whitelight corona. The experiment was aimed at exploring the small-scale structure of the corona, which could hold important clues with regard to the nature of energy input and dissipation involved in coronal heating, coronal instabilities and the expansion of the solar wind in the near-Sun environment. A large number of images were obtained during totality, principally with a video-CCD camera (>6,000 frames with 135 X 105 arc/sq sec f.o.v.) and a 7Omm-format photographic camera (451 frames with a 15 X 15 arc/sq min f.o.v.).