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Visn. Nac. Akad. Nauk Ukr. 2017. (8):16-28
https://doi.org/10.15407/visn2017.08.016

N.G. Shchukina
Main Astronomical Observatory of the National Academy of Sciences of Ukraine, Kyiv

MONITORING OF VARIATIONS OF PHYSICAL PARAMETERS OF THE SUN WITH 11-YEAR CYCLE OF ACTIVITY
According to the materials of scientific report at the meeting of the Presidium of NAS of Ukraine, May 31, 2017

The observational program of monitoring of long-term variation of solar lines is described. The aim of the program is to study how the physical parameters of the quiet solar atmosphere have changed over the last 11-year solar cycles. The research is based on high spectral resolution observations of the quiet Sun using the horizontal solar telescope ATSU-5 of the Main Astronomical Observatory of the National Academy of Sciences of Ukraine. The diagnostics of the solar cycle atmospheric variation is based on observations since 2012 of almost 40 spectral lines of neutral and ionized chemical elements at the solar disk centre and limb near north and south poles. The results of the observations show that the line core depth and full width at half maximum of the many solar spectral lines show response to the cycle modulation of the total unsigned magnetic field of the Sun. The behaviour of these line parameters can be explained by variations of the temperature and convective motions of the quiet photosphere with 11-year cycle of solar activity.
Keywords: Sun, telescopes, instrumentation for observations, spectral lines, solar magnetic field, 11-year cycle of solar activity.

Language of article: ukrainian

 

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