Three cycles of activity in the low corona

Details Three cycles of activity in the low corona Three cycles of activity in the low corona

Oct 1974

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974a%26a....35..283l&link_type=abstract

Astronomy and Astrophysics, vol. 35, no. 2, Oct. 1974, p. 283-288. In French.

Astronomy and Astrophysics

Astrophysics

16

Coronagraphs, Solar Activity, Solar Corona, Solar Cycles, Astronomical Maps, Astronomical Photometry, Monochromatic Radiation, Periodic Variations, Radiant Flux Density, Solar Observatories

Scientific paper

A synoptic description is given of observations performed on a survey basis at Pic-du-Midi Observatory since 1944 for monochromatic measurements and, since 1964, for K-corona studies. The stability of the Pic-du-Midi photometric system for monochromatic measurements is first studied, once the intensity scale has been transformed in order to eliminate a small nonlinearity near the origin. A comparison with data from other observatories is given. The same care is given to K-corona measurements, and three synoptic maps are drawn based upon annual averages which cover three solar cycles for monochromatic measurements and one cycle for the K-corona.

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