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- W2079462581 abstract "Abstract Solar radio fluxes, Zurich relative sunspot number R z , and Solar Call plage indexes daily values for the period 1957–1980 are analyzed in order to test the stability of the series with respect to time and solar activity. It is found that between the series of the 3,8 and 10 cm radio fluxes and the series of R z no significant trend with time, solar activity or solar cycle exists when mean values for periods of the order of one year are considered. Then, the daily solar u.v.-irradiances measured since 1969 for H-Lyman-alpha and-beta, the Hel-resonance line and HeII-Lyman-alpha are compared with the 10.7 cm radio fluxes and adjusted. After adjustment, the behaviour of the four series of irradiances with respect to the 10.7 cm flux shows a similar structure as the behaviour typical for the series of the 3 cm or the 8 cm fluxes. This adjustment allows the determination of the slope of the mean variation of the u.v.-irradiances with solar activity. The increases from solar minimum to solar maximum related to the minimum values are respectively : 60% for H-Lyman-alpha, 80% for H-Lyman-beta and 90% for Hel and Hell." @default.
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- W2079462581 date "1983-09-01" @default.
- W2079462581 modified "2023-09-30" @default.
- W2079462581 title "Solar indices and solar u.v.-irradiances" @default.
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- W2079462581 doi "https://doi.org/10.1016/0032-0633(83)90089-2" @default.
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