Physics
Scientific paper
Nov 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992esasp.348...73k&link_type=abstract
In ESA, Proceedings of the First SOHO Workshop: Coronal Streamers, Coronal Loops, and Coronal and Solar Wind Composition p 73-82
Physics
5
Plasma Diagnostics, Solar Corona, Solar Corpuscular Radiation, Solar Eclipses, Solar Physics, Brightness, Light Scattering, Soho Mission, Solar Magnetic Field, Space Plasmas
Scientific paper
Thanks to the availability of a large radiative flux in the optical region, solar total eclipses are rare occasions offering the opportunity of using sophisticated methods to analyze all parts of the highly structured white light corona. Coronal absolute intensities and line emissions, including their polarization, are studied to analyze density and temperature inhomogeneities, velocities and magnetic fields. Detailed density distribution is directly extracted from fine coronal structures. During the 1991 eclipse, the large 3.6 m aperture CFH (Canada France Hawaii) optical telescope was used to analyze time sequences over small coronal fields and to reach the finest structure; results from this experiment are presented including the analysis of the faintest detected feature and small scale dynamical plasma processes. To prepare the SOHO (Solar and Heliospheric Observatory) mission on coronal physics, an overview of what is known on coronal structures from eclipse observations of the past solar cycles is given. The nonpotential nature of the coronal magnetic field is well illustrated by the large deviation of streamers from the radial direction as well as by the systematic occurrence of tangential discontinuities at edges of streamers.
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