The coronal hole at the 7 March 1970 solar eclipse

Details The coronal hole at the 7 March 1970 solar eclipse The coronal hole at the 7 March 1970 solar eclipse

Feb 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975soph...40..351w&link_type=abstract

Solar Physics, vol. 40, Feb. 1975, p. 351-358. Research supported by the Swiss National Science Foundation.

Physics

10

Line Spectra, Solar Corona, Solar Eclipses, Astronomical Photometry, Electron Density (Concentration), Emission Spectra, Fine Structure, Luminous Intensity, Polar Regions, Spectral Emission, Spectral Energy Distribution, Synoptic Measurement, X Ray Spectra

Scientific paper

Results are presented for white-light photometric analysis of a coronal hole appearing in the SW quadrant of the sun during the total eclipse of March 7, 1970. The parameters of the corona and the hole are described, and the intensity of the K-component is used in the analysis. It is found that the hole extended into the polar zone and that the density distribution in the central part of the hole was less than 10% of that in the undisturbed corona outside the hole and increased sharply in the outer part. The appearance of a coronal hole over the polar cups before and after a sunspot minimum is described, and the necessity of distinguishing between long-term polar holes and short-term holes at lower latitudes is stressed.

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