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Long-term trends in solar activity. Variations of solar indices in the last 40 years

Research in Astronomy and Astrophysics 2019年第7期19卷 1-12页

作者： Elena Bruevich Vasily Bruevich Sternberg Astronomical Institute Moscow State University

We analyze long-term variations of several solar activity indices(AIs) that have been measured over the last 40 *** this goal,we study the AIs that characterize the fluxes from different areas in the solar *** consideration of mutual correlations between the solar indices is based on the study of relationships between them in the period from 1950 to *** period of time,covering activity cycles 19–22,is characterized by relatively stable relations between the *** investigate the normalized variations of these indices in recent time in relation to their values which were calculated by considering radiation from the sun in the radio range at a wavelength of 10.7 cm(F10.7) in 1950–*** analysis of time series,representing variations of the normalized AI(AIFF) in solar cycles 23–24,shows different trends exist for different indices in terms of their long-term *** assume that variations of normalized International sunspot Number(SSN),F530.3 and Flare Index,which have shown sharp decreases in the last 40 years,are possibly associated with a decrease in the intensity of large-scale magnetic fields in the photosphere(SSN) and in the corona(the coronal index and the Flare Index).

关键词： method data analysis-sun activity indices

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