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- W2056918646 abstract "THE result of the recent identification of coronal lines (by Edlén) and the very high electron temperature found in the inner part of the solar corona should be the presence of a very hard and intense monochromatic radiation in the spectrum of the latter. According to Edlén, the resonance potential of iron ions emitting coronal lines is about 35 V. If the electron temperature of the corona is 350,000° (as assumed by Grotrian) the mean kinetic energy of the coronal electrons will be about 35 V. Therefore, every inelastic collision of an electron with a coronal iron ion may bring about the excitation of the resonance level of the latter. One can prove that in the corona the average frequency of excitation of levels with a potential of excitation between 35 and 70 V. by an electron collision will be of the same order as the frequencies of excitation of the sub-levels of the ground configuration. These sub-levels are the initial levels for the radiation of coronal lines." @default.
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- W2056918646 date "1946-06-01" @default.
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- W2056918646 title "Possibility of Emission of a very Hard Radiation from the Solar Corona" @default.
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- W2056918646 doi "https://doi.org/10.1038/157840b0" @default.
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