Physics
Scientific paper
Mar 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981soph...70....3d&link_type=abstract
Solar Physics, vol. 70, Mar. 1981, p. 3-24. Research supported by the Centre National d'Etudes Spatiales.
Physics
4
Coronagraphs, Electron Density (Concentration), Polarimetry, Solar Corona, Solar Electrons, Balloon-Borne Instruments, Cinematography, Polarized Light, Solar Limb, Solar Temperature
Scientific paper
The solar corona is discussed on the basis of observations made during a 5-hour period in France in September 1971. Using a balloon at an altitude of 32,000 m, the solar corona was cinematographed from 2 to 5 solar radii with an externally occulted coronagraph. It is noted that motions in coronal features, when they occur, exhibit deformations of structures with velocities not exceeding a few tens of km/s. Several streamers were often involved simultaneously; these variations are compatible with magnetic changes or sudden reorganizations of lines of forces. Intensity and polarization measurements are shown to give the electron density with height in the quiet corona above the equator. Three-dimensional structures and localizations of the streamers are deduced from combined photometry, polarimetry, and ground-based K coronametry.
Dollfus Audouin
Mouradian Zadig
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