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• W1991453215 abstract "Changes in the total electron content of the ionosphere near sunrise are used to determine the integrated production rate in the ionosphere (Q) from 1965 to 1971, at latitudes of 34°S, 20°N and 34°N. The solar cycle change is given approximately by Q∝S − 20, where S is the 10.7 cm solar flux. All stations show a regular semiannual variation in Q, through a range of 1.3:1. This is interpreted as an increase in the ratio ON2 (the relative densities of atomic oxygen and molecular nitrogen) near the equinoxes. Northern hemisphere values of Q are nearly twice as large as southern hemisphere results, requiring an increase of about three times in the ratio ON2 in the northern hemisphere. This ratio decreases in summer, near solar maximum, giving the well-known seasonal anomaly in the ionosphere. The seasonal change is larger at 34°N than at 20°N, and is completely absent at 34°S. Measurements of the time at which sunrise production begins confirm that the absorption of solar radiation is primarily by N2 at all times at 34°S, but changes from N2 in summer to atomic oxygen in winter in the northern hemisphere near solar maximum." @default.
• W1991453215 created "2016-06-24" @default.
• W1991453215 creator A5024875961 @default.
• W1991453215 date "1974-07-01" @default.
• W1991453215 modified "2023-10-15" @default.
• W1991453215 title "Changes in atmospheric composition inferred from ionospheric production rates" @default.
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• W1991453215 doi "https://doi.org/10.1016/0021-9169(74)90111-1" @default.
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