Reexamination of the coronal index of solar activity before the year 1965

Details Reexamination of the coronal index of solar activity before the year 1965 Reexamination of the coronal index of solar activity before the year 1965

Sep 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003esasp.535..247r&link_type=abstract

In: Solar variability as an input to the Earth's environment. International Solar Cycle Studies (ISCS) Symposium, 23 - 28 June 2

Physics

1

Solar Corona: Solar Activity

Scientific paper

The coronal green line intensity of the Sun is a useful parameter to study activity in the corona. An coronal index of solar activity (CI), was previously obtained for the period 1939-2002, based on the photometric scale from Lomnický Štít where observations began in 1965. This earlier construction of CI was suspect because its solar cycle maxima values did not closely track cycle peak sunspot numbers, contrary to expectation. In the revised construction of the CI, we use correlations of the Lomnický Štít based CI with the Wolf (sunspot) number, the 2800 MHz solar radio flux, and galactic cosmic ray intensity to derive CIs for years before 1965. The correlation between the sunspot number and CI in the period 1965-2002 allows reconstruction of CI back to 1818.

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