Modified Coronal Index of the Solar Activity

Details Modified Coronal Index of the Solar Activity Modified Coronal Index of the Solar Activity

May 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010soph..263...43l&link_type=abstract

Solar Physics, Volume 263, Issue 1-2, pp. 43-49

Physics

Corona, Solar Cycle

Scientific paper

The original coronal index of the solar activity (CI) has been constructed on the basis of ground-based measurements of the intensities of the coronal line of 530.3 nm (Rybanský in Bull. Astron. Inst. Czechoslov., 28, 367, 1975; Rybanský et al. in J. Geophys. Res., 110, A08106, 2005). In this paper, CI is compared with the EUV measurements on the CELIAS/SEM equipment based on the same idea as the original idea of the coronal index. The correlation is very good for the period 1996 - 2005 ( r=0.94 for daily values). The principal result of this paper is the introduction of the modified coronal index (MCI) which in all uses and contexts can replace the existing CI index. Daily MCI values extend over a time period of six solar activity cycles. Future MCI measurements will be derived from more reliable measurements made by space-based observatories that are not influenced by the weather. MCI measurements are and will continue to be archived at the web site of the Slovak Central Observatory in Hurbanovo ( http://www.suh.sk/obs/vysl/MCI.htm ).

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