Green Corona versus Photospheric Magnetic Flux: Solar Cycle Dependence

I. Dorotovic1, J. Rybák2

1Slovak Central Observatory, P.O.Box 42, SK-94701 Hurbanovo, Slovakia
2Astronomical Institute of the Slovak Academy of Sciences, SK-05960 Tatranská Lomnica, Slovakia

Abstract:

Relationship between the green corona and the photospheric magnetic flux is analyzed over the epoch 1995-2001. Homogeneous dataset of the green coronal line intensities and Kitt Peak magnetic flux data are used for determination of this relationship. In particular, solar cycle dependence of numerical relation between these two parameters has been investigated. It was shown that any overall fit with fixed parameters for the epoch several years long is unrealistic in order to describe this relation because the fit was found to be time dependent. The coefficients of the linear fit, used in the paper, display a quite significant changes of their values in time. Moreover, inverse relation of the absolute and the linear coefficients of the fit was obtained during the ascending phase of the solar cycle between the year 1998 and 2001. Therefore, in order to extrapolate magnetic flux data before the year 1975 using existing longer datasets of the green coronal intensities, it is necessary to take into account the revealed solar cycle dependence of their relation and to estimate the quantitative parameters of relation separately for the individual phases of the solar cycle.


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