The large-scale behaviour of the green emission corona FeXIV 530.3 NM over the last 4.5 solar activity cycles

Astronomy and Astrophysics – Astronomy

Scientific paper

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Emission Spectra, Solar Corona, Solar Cycles, Solar Rotation, Solar Spectra, Astronomical Observatories, Brightness, Fine Structure, Line Spectra, Solar Activity, Spectrum Analysis

Scientific paper

Existing coronagraphic measurements, obtained by the world-wide net of observatories, are used to characterize the large-scale variabilities and periodicities in the 530.3 nm emission corona over the period 1943-1991. Specifically, the time-latitude distribution of the coronal brightness is shown and in this connection the double maxima of the solar cycles, fine structure of the butterfly diagrams, N-S asymmetry and two modes -- rigid and differential -- of the coronal rotation are discussed.

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