Variations in the H Lyα Intensity in Solar Activity Cycles from Measurements Onboard Satellites and Rockets

摘要

Data on radiation intensity of the Sun's Lymanalpha hydrogen line (λ = 121.6 nm) for a maximum and minimum of solar activity are considered. Results of longterm measurements, received onboard 5 American and 9 Russian satellites and space vehicles for a period from 1969 till 1998, as well as data of numerous rocket measurements, since 1955 are analyzed. Radiation of the quiet Sun (without flares) in the Lα line differs between phases of a solar activity cycle andchanges from cycle to cycle were observed. Radiation intensity at the minimum of a solar activity cycle varies from (2.25-4.3) * 10~(11) cm~(-2)s~(-1) for activity minimum to (6.1-9) * 10~(11) cm~(-2)s~(-1) for a maximum of a cycle.