Coronal index of solar activity - Solar-terrestrial research

Details Coronal index of solar activity - Solar-terrestrial research Coronal index of solar activity - Solar-terrestrial research

Jan 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001ssrv...95..227r&link_type=abstract

Space Science Reviews, v. 95, Issue 1/2, p. 227-234 (2001).

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Scientific paper

The purpose of this paper is to introduce a coronal index of solar activity (CI) as computed from ground-based observations of the green coronal line intensities (Fexiv 530.3 nm). This index, expressed in W s^-1, is derived for the period 1939-1998 and belongs to the class of ground-based indices used to study solar activity and its influence on the heliosphere. The smoothed peak solar cycle intensity of the CI increased monotonically during the period of research. On the other hand, comparative studies have shown relatively good agreement with similar solar indices. CI can be used to study, among other things, the rotation of the Sun as a star, and long-term, intermediate- and short-term periodicities. The CI is inferred from a homogeneous coronal data set that can be used to study such topics as the 2D distribution of the green corona and photospheric/chromospheric activity, the differential rotation of the emission green corona, and the relationship between the green corona and cosmic rays.

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