Coronal index of solar activity

Details Coronal index of solar activity Coronal index of solar activity

Mar 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988baicz..39..106r&link_type=abstract

Astronomical Institutes of Czechoslovakia, Bulletin (ISSN 0004-6248), vol. 39, no. 2, Jan. 1988, p. 106-119.

Astronomy and Astrophysics

Astronomy

29

Emission Spectra, Forbidden Transitions, Line Spectra, Solar Activity, Solar Corona, Solar Cycles, Solar Limb, Solar Magnetic Field

Scientific paper

Daily values of the coronal index (CI) are reported for the years 1977-1986 which are a continuation of the data published earlier for the years 1964-1976. The CI represents an irradiance of the whole 530.3 emission corona for the sun as a star, and indicates very well the activity of underlying layers in the corona. The obtained results have verified the reality of the 530.3 nm coronal irradiance variations over the time scales of days and months similarly as in cycle 20. These short-term variations are associated with the evolution and rotation of active photospheric areas, controlled by magnetic fields. The maximum irradiance in cycle 21 took place in the second half of 1981, i.e., about two years after Wolf's number maximum.

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