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Paper: On the Time Variation of the Magnetic Strength Ratio for Different Combinations of Spectral Lines
Volume: 526, Solar Polarization Workshop 8
Page: 271
Authors: Demidov, M. L.; Kiselev, A. V.
Abstract: The magnetic strength ratio (MSR) (the ratio of observable strengths Bλ1/Bλ2 in the two spectral lines) is a good indicator of the relationship between strong (order of kG) and weak (no more than a few hG) components of solar magnetic fields. Many studies have been devoted to explore the spatial and temporal variations of the MSR for different combinations of spectral lines pairs in order to diagnose solar magnetic fields. In this investigation we use long-time (1999–2016), multi-lines Solar Mean Magnetic Field (SMMF) observations made at the STOP telescope at the Sayan Solar Observatory (SSO). The SMMF is an important global parameter of solar magnetism, closely connected with the activity cycle and the distribution of large-scale, quiet-Sun magnetic fields across the solar disk. It could be expected that SMMF MSR should show solar cycle variations due to different contributions from different magnetic structures. Instead, our observations have shown only tiny cycle variations. The reason for that is not clear yet, and new observations are necessary. Additionally, we present the results of a cross-comparison of SSO and Wilcox Solar observatory SMMF data sets (SSO measurements in Fe I 5250.2 Å, were used in this case). Despite two observatories using the same spectral line, regression coefficients between them show some time variations.
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