Asymmetric variations of the coronal green line intensity

Details Asymmetric variations of the coronal green line intensity Asymmetric variations of the coronal green line intensity

Sep 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988soph..115..367t&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 115, no. 2, 1988, p. 367-384.

Physics

24

Solar Corona, Solar Magnetic Field, Solar Spectra, Spectral Energy Distribution, Solar Cycles, Solar Wind, Symmetry, Visible Spectrum

Scientific paper

The analysis of the daily measurements of the coronal green line intensity, which have been extensively tested for homogeneity and freedom of trends observed at the Pic-du-Midi observatory during the period 1944 - 1974, has revealed some characteristic asymmetric variations. The NW solar-quarter appears to be the most active of all in the 22-yr cycle 1949 - 1971, while in the periods 1944 - 1948 and 1972 - 1974 the SW quarter is the most active. The green line intensity distribution shows that the maximum values of the asymmetries occur in heliocentric sectors ±10° - 20° far from the solar equator on both sides of the central meridian. Physical mechanisms like different starting time of an 11-yr solar cycle in the two solar hemispheres, the motion of the Sun towards the Apex, and short-lived "active" solar longitudes formed by temporal clustering of solar active centers, have been discussed.

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