LYMAN DECREMENTS OF NEUTRAL HYDROGEN LINES IN THE SPECTRUM OF THE SUN BASED ON SDO/EVE OBSERVATIONS. VARIATIONS DURING THE 24-th SOLAR CYCLE AND IN INDIVIDUAL FLARES OF CLASSES M AND Xстатья

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[1] Bruevich E. A., Bruevich V. V. Lyman decrements of neutral hydrogen lines in the spectrum of the sun based on sdo/eve observations. variations during the 24-th solar cycle and in individual flares of classes m and x // Astrophysics. — 2019. — Vol. 62, no. 3. — P. 377–386. Data from satellite observations of fluxes in Lyman series lines and their relative variations, both during the 24-th cycle and in individual class M and X flares, are analyzed. The decrement D1 ( D1  F(L )/ F(L ) ) has varied over the 24-th activity cycle by roughly 25% from its maximum values to minimum values during 2014, when there was a secondary maximum in the 24-th cycle according to the main indices. Decrement D2 ( D2  F(L  )/ F(L ) ) varies by roughly 10% during the cycle, and decrement D3 ( D3  F(L )/ F(L) ), by roughly 5% during the cycle. D1, D2, and D3 also vary during the cycle at smaller amplitudes with periods analogous to the periods of the quasi-biennial variations of the main activity indices. In flares of x-ray classes from M to X the variations of the Lyman decrements range from 2 to 20%, with the variations in the decrements being larger on the average for flares with higher energies in the soft x-ray range. [ DOI ]

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