CFHT eclipse observation of the very fine-scale solar corona

Details CFHT eclipse observation of the very fine-scale solar corona CFHT eclipse observation of the very fine-scale solar corona

Jan 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...281..249k&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 281, no. 1, p. 249-257

Astronomy and Astrophysics

Astrophysics

26

Solar Corona, Solar Eclipses, Solar Transition Region, Solar Wind, Cameras, Faculae, Solar Magnetic Field, Telescopes, Thomson Scattering

Scientific paper

At the July 11, 1991 solar total eclipse, a modern large optical telescope, Canada-France-Hawaii telescope (CFHT), was used to probe the solar corona. The best possible pictures were obtained with the CFHT, using fast imaging techniques and post-facto image selection and processing. Several cameras were run during totality to acquire sub-arcsec spatial resolution white-light images, with both narrow-band and broad-band filters. The setup and the observing procedure are described. Preliminary results, together with an evaluation of the merits of the experiment, are given, as well as a sample of images. Fine-scale coronal features were observed for the first time in a time series, confirming the importance of plasmoid-like activity in the inner corona. The observation of the smallest coronal feature ever reported is analyzed, giving a typical cross-section of 0.4 +/- 0.1 arcsec. On a larger scale, dark loops around a foreground prominence are resolved for the first time, suggesting that sheet-like voids exist above a filament channel.

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