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- W2332014580 abstract "Comparison of $E$ region observations from 1930 to 1938 of ionosphere stations scattered over the earth with the theory of ionization caused by solar radiation absorbed exponentially in a relatively quiet terrestrial atmosphere yielded the conclusions: (1) the diurnal variation of ${y}_{m}$, the maximum-with-height value of the equivalent electron density, during daylight is in close accord with the theory with the recombination coefficient $ensuremath{alpha}$ proportional to ${{y}_{m}}^{2}$ and equal to 2ifmmodetimeselsetexttimesfi{}${10}^{ensuremath{-}8}$, or perhaps greater; (2) ${y}_{m}$ at night was not in accord with the theory, but the data do not preclude a night value of $ensuremath{alpha}=2ifmmodetimeselsetexttimesfi{}{10}^{ensuremath{-}8}$ or greater provided suitable hypotheses are added to the theory; (3) the morning increase in ${y}_{m}$ was observed at Washington near midsummer to begin about 35 minutes before ground sunrise, whereas the theory put it about 20 minutes; (4) the seasonal variation of noon ${y}_{m}$ agrees with the theory at stations in latitudes from 12ifmmode^circelsetextdegreefi{} S to 80ifmmode^circelsetextdegreefi{} N; (5) at any season noon ${y}_{m}$ falls off with latitude more rapidly than the theoretical expectation. A relation between noon ${y}_{m}$ and sunspots is given." @default.
- W2332014580 created "2016-06-24" @default.
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- W2332014580 date "1939-04-01" @default.
- W2332014580 modified "2023-10-16" @default.
- W2332014580 title "TheERegion of the Ionosphere" @default.
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- W2332014580 doi "https://doi.org/10.1103/physrev.55.639" @default.
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