The Rumford Spectroheliograph of the Yerkes Observatory
The Rumford Spectroheliograph of the Yerkes Observatory
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In our eReader you can find the full English version of the book. Read The Rumford Spectroheliograph of the Yerkes Observatory Online - link to read the book on full screen. Our eReader also allows you to upload and read Pdf, Txt, ePub and fb2 books. In the Mini eReder on the page below you can quickly view all pages of the book - Read Book The Rumford Spectroheliograph of the Yerkes Observatory
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Suppose the bright K 2 line to be absent. In this case the contrast between different regions would depend, to a considerable degree, 15 upon variations in the absorption of the calcium vapor in the upper and cooler parts of the chromosphere. If the second slit were not much wider than K 3 a particularly cool region, in the chromosphere or in a prominence, might show as a dark structure.
Let us now suppose, as is actually the case in practice, that K s appears as a bright line at numerous point...s on the Sun's disk. In general, being produced under greater pressure in the lower part of the chromosphere, the bright K 8 should be broader than the dark K 3, while the latter line must appear superposed upon K 2 in all cases but one. This exception is the region over the umbra of Sun-spots, where the denser calcium vapor corresponding to K 2 is absent, and the rarer vapor at a higher level gives a bright K 3 line (usually not very intense) on the darker background of the spectrum of the umbra.
What to read after The Rumford Spectroheliograph of the Yerkes Observatory?
You can find similar books in the "Read Also" column, or choose other free books by Hale George Ellery to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
Suppose the bright K 2 line to be absent. In this case the contrast between different regions would depend, to a considerable degree, 15 upon variations in the absorption of the calcium vapor in the upper and cooler parts of the chromosphere. If the second slit were not much wider than K 3 a particularly cool region, in the chromosphere or in a prominence, might show as a dark structure.
Let us now suppose, as is actually the case in practice, that K s appears as a bright line at numerous point...s on the Sun's disk. In general, being produced under greater pressure in the lower part of the chromosphere, the bright K 8 should be broader than the dark K 3, while the latter line must appear superposed upon K 2 in all cases but one. This exception is the region over the umbra of Sun-spots, where the denser calcium vapor corresponding to K 2 is absent, and the rarer vapor at a higher level gives a bright K 3 line (usually not very intense) on the darker background of the spectrum of the umbra.
What to read after The Rumford Spectroheliograph of the Yerkes Observatory?
You can find similar books in the "Read Also" column, or choose other free books by Hale George Ellery to read onlineMoreLess
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