 | 1869 - 508 pages
...what it would be at a higher level. We have then two causes for the darkening of a spot : — first, the general absorption of the chromosphere, thicker here than elsewhere as the spot is a cavity, and secondly, the greater selective absorption of the lower sodium, barium, magnesium stratum, the... | |
 | 1869 - 340 pages
...at a higher level. The author thinks there are two causes for the darkening of a spot, viz. : — 1. The general absorption of the chromosphere thicker here than elsewhere, as the spot is a cavity. 2. The greater selective absorption of the lower sodium, barium, magnesium stratum, as the surface... | |
 | James Samuelson, Henry Lawson, William Sweetland Dallas - 1866 - 584 pages
...is that all the gradations of darkness, from thefacula; to the, central uml/ra, are thus sup]>osed to be due to the same cause — namely, the presence, to a greater or less extent, of a comparatively cold absorbing atmosphere "In conclusion, we would venture to suggest that if the photosphere... | |
 | 1866 - 352 pages
...render it probable that the various degrees of luminosity observed on the Sun's disk are all due to one cause, namely, the presence to a greater or less extent of a comparatively cold, absorbing atmosphere. The second series, which is based on measurements of the... | |
 | Amédée Guillemin - 1867 - 588 pages
...with other facts. In this paper all differences of luminosity on the surface of the Sun are referred to the same cause, namely, the presence to a greater or less extent of a comparatively cold absorbing atmosphere. — B SJ had travelled a considerable distance when the observations... | |
 | Royal Institution of Great Britain - 1869 - 636 pages
...this explanation that all the gradations of darkness, from the faculte to the central umbra, may be supposed to be due to the same cause, namely, the...extent of a relatively cooler absorbing atmosphere ; thus suggesting as one cause of the darkening of a spot — 1. The general absorption of the atmosphere,... | |
 | 1869 - 342 pages
...suggested, as one advantage of this explanation, that all the gradations of darkness, from the faculse to the central umbra, are thus supposed to be due to the same cause — namely, the presence of a greater or less extent of a relative cooler absorbing atmosphere. This, I think, is spectroscopically... | |
 | 1869 - 668 pages
...at a higher level. The author thinks there are two causes for the darkening of a spot, viz. : — 1. The general absorption of the chromosphere thicker here than elsewhere, as the spot is a cavity. 2. The greater selective absorption of the lower sodium, barium, magnesium stratum, as the surface... | |
 | Royal Institution of Great Britain - 1869 - 646 pages
...darkness, from the faculoo to tho central umbra, may be supposed to be due to the same cause, namely, tho presence to a greater or less extent of a relatively cooler absorbing atmosphere ; thus suggesting as one cause of tho darkening of a spot — 1. The general absorption of the atmosphere,... | |
 | 1870 - 298 pages
...suggested, as one advantage of this explanation, that all the gradations of darkness, from the faculae to the central umbra, are thus supposed to be due to the same cause — namely, the presence of a greater or less extent of a relative cooler absorbing atmosphere. This, I think, is spectroscopically... | |
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... supposed to be due to the same cause, namely, the presence to a greater or less extent of a relatively cooler absorbing atmosphere. 
